Playing at 4k+ resolutions, the difference between a well implemented quality DLSS and native ranges from barely distinguishable to objectively better because DLSS is also great anti aliasing. And even if you really need native resolution, DLAA is almost always better than any other anti aliasing method. Before DLSS 2 came out you might have had a point, but now I simply disagree with your statement.
Proton is based on wine, which is copyleft so valve didn’t exactly have a choice in keeping it open source. I also don’t necessarily think that their goal was to reach the rather small existing user base of Linux users, but rather they wanted to make sure they aren’t at the will of a bigger company (Microsoft) whose product is/was required to run most of what valve makes money with.
You know people can harass women or be dicks to their coworkers/subordinates and not be transphobic, right? Also, as of 2022, about 65 people work at Linus tech tips. Saying “Everyone was cool with it and endorsed it” is a bit of a broad statement to make.
I think two out of those believes stem from survivorship bias. You think of old music and consumer products as superior because the only ones that “survived” are the good ones. No one remembers bad music from 50 years ago, and for every old thermos flask/blender/knife that you see around there are dozens that broke years ago.
Looking at RPCS3, it seems like most PS3 games wouldn’t run well on PS5 without dedicated, PS3-like hardware.