In your example of The Witcher, coming from the games, I think people were (rightly) annoyed by them not being cast to look somewhat like the characters in the games. I am all for "best person for the job" type deals, but that was a mis-step in my opinion. I didn't have any problem with the way Yennefer acted, but the actress didn't reflect the source material that well, nor how she looked in the games.
This is all just my personal opinion but given that the games are just one studio's interpretation of the characters, I think it's fair for the Netflix adaptation to bring its own interpretations of the text-only source material into play. I have been well aware of the games since the first one (my partner has them all) but I have never had even the slightest interest in playing them and the aesthetic of the characters (male and female) is part of that disinterest. They don't stand out, as someone who hasn't sat in a game with them for hours clicking through their sultry dialogue. I just Googled the women from the games and honestly, they all look
really similar to one another except for different hair and eyeliner styles. That's not how actual Polish women look and it's not how my mind's eye would have visualised them from the written source material. That was an aesthetic choice on the part of the game adaptation.
I haven't read the books so forgive me from basing this on Google image search, but is there any meaningful aesthetic difference between game Yennefer and Netflix Yennefer? Both are fierce-looking, dark-haired beauties. Most of game Yennefer's visual identity as a character comes from her clothing and makeup. They could have spent a long time looking for an exact face-clone of the idealised, pin-up style CG design but if they were dead set on an exact 1:1 aesthetic copy, finding one who could also carry the role with the right blend of confidence and vulnerability would have been very hard indeed. If there's any explicit plot-based racial segregation in the game world which would make it confusing to have an Asian-looking woman not coming from the faux-Asia region of their world, perhaps that didn't come across in the Netflix version, but I kind of got the impression that real-world race was irrelevant and the different fantasy races replaced that aspect of society.
Maybe people have differing ideas of what constitutes the 'essence' of a character. Maybe it's more visual for some people and more about how the actor carries themselves for others, which is how such wildly divergent ideas of good casting come about. For me, race is irrelevant unless race is a specific plot point in that series.
I know that me mentioning this is going to backfire but sometimes casting the 'wrong' aesthetic for an established character can lead to a more powerful interpretation. The real George Washington was undeniably a privileged white guy. However, every George Washington I saw in the media growing up focused on the visual side - actors who physically resembled contemporary depictions of the man - and I found every single one of them unrelatable, more like idealised symbols than believable human beings. The slavish dedication to creating a 1:1 replica made it harder for me to understand why people in the US thought he was such a big deal. Enter Hamilton and a version of George Washington who looked nothing like any of the portraits. Setting aside all other opinions about the musical and its fans, for the first time in my life I 'got' George Washington thanks to the stage actor's portrayal. He was charismatic, intelligent, decisive and pragmatic. He had a gravity to his interactions which had been thoroughly absent in every cartoon, game or live action rendition of the historical figure I'd seen in the past, which tended to expect the audience to accept that he was charismatic without actually showing it properly. Yeah, the guy wasn't a bald black man in real life by any stretch of the imagination, but everyone knows that. The show wasn't trying to rewrite the established history, it was trying to reframe it in a way that carried the 'essence' of the story more the details. It's ridiculous, and I honestly have no idea how much next level genius was required to realise that this was how the character would 'click' so well, but somehow it did and it blew my mind.
We get this sometimes in anime too. One of my all-time favourite shows is the bonkers action romp Sengoku BASARA, which reimagines Japanese historical figures as hyper-exaggerated flying robots, tokusatsu heroes and modern day shrine maidens. It's
nuts and while there are plenty of nods to actual historical detail for anyone paying close attention, the staff of the game series made an active design decision to focus on the 'essence' of each character more than recreating what already existed. My usual preference is for realistic historical anime but at the same time, I freaking love Sengoku BASARA. Its overt dismissal of convention and common sense gave me a much deeper understanding of the main players of the Warring States period than anything I'd seen before, without diminishing the more 'authentic' period shows in any way. Most Japanese history buffs understand that these reimaginings of the stuffy topics people are forced to learn at school are a great way to get them more involved in researching the facts in a way that 1:1 reenactments never will.
Anyway, when the Netflix version of The Witcher was first being advertised as an upcoming show I still had no interest in watching, having been left cold by the games, but I joined my partner to watch the first episode just so that I could see what it was all about (Geralt being such a persistently popular character made me curious). The rest is history; we devoured the show really quickly and I ended up buying the soundtrack and getting really into the series. Since then even my aged mother-in-law (who has never played a video game in her life) has stumbled upon the Netflix adaptation and ended up enjoying it. From that perspective the Netflix version feels as though it was a rousing success. It expanded the audience of the original games beyond their (fairly saturated) demographic and gave the successful series another shot in the arm by making it more accessible. The games still exist for game purists, so everyone wins, right?
(Since it keeps coming up unprompted I have no particular opinion on the whole 'woke' bashing trend that recently started; as with the 'SJW' bashing and 'feminist' bashing and all of the other keyword-bashing movements it's sort of irrelevant, because I don't define myself by others' assessments of my opinions or the perfection of other people whose ideals occasionally overlap. If anyone wants to write me off because I share some opinions with the current trendy villains of the Internet, that's their choice. My skin is pretty thick.)
R