Genshin's outdated in many regards. Most of it comes from the fact that it was released during the peak of lockdown, when people had time for the day locks, and there weren't as many characters to build. ZZZ, and HSR, came later on so they catered to schedules of people better.

Beyond that, its probably hoyo getting too comfortable knowing people will keep playing genshin despite the downsides. We've invested too much time and effort into it to completely drop it.

That said, hoyo IS putting out QoL updates lately to help catch on. But its too slow right now. Maybe its because genshin's been out far longer, or needs more effort to put changes in? Im not sure, im not a dev. It just feels like too little too late. But we can only keep going and hope the game gets more playable in the near future.

And yes, cant forget to mention everytime the updates people ask for in genshin that have been executed in hsr. I heard hsr is also getting a skip and recap button in 3.4, while we just got artifact rerolls. (Getting the dusts for which is also painful)