Because that's not my experience. I run the game just fine, even online with 8+ member lobby at 1440p. Yes framerate does go down with that many people, but this isn't an FPS shooter.
So yea, sorry I can't empathize with those people who were complaining about playing a slide show or not even being able to get the game up and running. I don't mind PH optimizing the game for more FPS, I just hope it doesn't come at the expense of graphical fidelity.
Well, that seems to be a bit more of a reasonable response. So I'll just say two things.
Firstly, I just wanted to add that the performance issues aren't exactly linked to poor hardware. Some users with the bare minimum system specs can get a stable 30-40 fps while others with beefy i7-i9 paired with rtx 3090 cards (and your AMD equivalent) have struggled to maintain 20fps.
Although you may currently run things alright with your comp, after the "major system overhaul" is pushed out, you may be in the unfortunate group of people that can't run the game well anymore.
Second, since you didn't seem to like the idea of the graphics getting downgraded later on, I'd like to point out that it's likely that they will. Since the dev team doesn't seem to want to properly add quality settings, it is likely that the graphics will continue to get downgraded in harem mode to satisfy the average user.
Good to note however, there are ways to mitigate this to an extent. So long as people keep posting and updating guides on steam, you should be able to boost the quality above whatever level they decide to lower it to.
So, just keep this stuff in mind while you support them and partake in the beta. I'm not going to try to tell you not to support them or spend your money, I'd just rather have you aware of the situation and how you might actually fix some of the problems the game may have.