Did they ever?
For a company whose only line of business is making anime DVDs and Blu-ray, they're not half hopeless at putting together anime DVDs and Blu-ray.
I've yet to watch it, but after reading about the subtitle timing issue on
Demon City Shinjuku that
@RebelNotorious pointed out, that's the last self-authored Manga release I'll buy without first waiting to hear how it's turned out.
Didn't know about the Demon City Shinjuku timing issue, more reason for me to go for the Discotek Media releases.
If there's one thing that has me concerned in recent months it's actually CLANNAD. For context, basically last Summer the series was added onto Funimation's streaming platform which is great for consumers but the issue is down to the encoding that was used for it.
Sentai Filmworks before the past four years (or so) had some 'okay but not great' authors and CLANNAD was one of them (it was one of the first Blu-rays for the distributor if I recall considering it came out in 2011 - that's 10 years ago). CLANNAD's encode in the 2011 release is rather dated/old so it doesn't have the best video presentation (technical stuff like incorrect gamma or brightness) as well as using an older font or older translation for the subtitles.
Sentai re-released the series in 2017 and 2020; both of which amended these issues and revised the translation from what I have been told. There's currently no way to tell whether Manga's 2021 release is using which encode until someone checks the discs because both the 2011 and 2017/2020 versions had the same 6 disc count.
K-On!, if that ever happens, is going to be even messier because the Funimation streams also used the older encodes (Season 1: Bandai Entertainment Blu-rays, Season 2: Sentai Collection 1 & 2 Blu-rays) so you're going to end up with lossy audio and other video presentation issues and potentially lacking the mini-shorts that were eventually included in both the US Limited Edition and Ultimate Collection standard set.
Haruhi, if that ever happens, will be fine. Funi's discs are pretty good as they do the job (and the only issue that I could see potentially happen is if Manga decides to omit the DVD bonus features discs).
Now I mention these things because there's been such a large gap in releases between the US and UK to the point where there's really no excuse to not use the newer encodes/discs already out there. If Manga uses the really old first versions for CLANNAD and K-On!, it's a disservice to those who have been waiting years to own the series on Blu-ray - sure the price might be right and the collector's packaging would look great, but if the discs don't work out then it's going to be a disappointment. I guess it's like cake - it may look great and smell good, but if the taste isn't up-to-scratch then it's a disaster.
All anime released on Blu-ray in Japan are region free.