I was getting increasingly worried reading that until I got to the action RPG bit: if it's not turn based then I can resist the temptation! I did love the Danganronpa games though, so if there is a console version I would definitely get that and not be tempted by the gacha-iness... Or so I hope anyway!
I do love the 3 gachas I'm playing now but with my ocd-esque nature and fomo, I become a bit obsessive with these, but still enjoying them otherwise it definitely wouldn't be worth the time, especially as they're still great stress relief!
HBR has a solid dramatic storyline and great humour, so good fun for Jun Maeda fans and I'm unsurprisingly engrossed in it. Characters are quite likeable and the grind is nowhere near as bad as the HSR rng-insane multi-variable grind, and surprise surprise even the older characters that aren't super premium are very functional and can clear end game content (not to mention the game loves throwing 5*/SS characters at players regularly

). HSR just disrespects it's own characters making their premium ones nigh irrelevant for end game content, exactly like you said whether you've paid for them or not. The amount of grind required to level them fully is just salt on the wound. I really hope the rumoured levelling up for older characters brings them a lot closer to the newer releases...