You really underestimate how many people play on 10+ year old PCs and blame everything except their hardware for low performance.
Just go to reviews of any game that does not have pixel art graphics and you'll notice the exact same comments on negative reviews, irrelevant hardware, windows 7 and rant how game is "badly optimized" or has "bad graphics".
That's assumptions on your side. As an outsider it is impossible to know which computer and game settings the players run.
I think it is reasonable to demand that a new game should be decently playable on a 5 year old machine with low-medium settings. And often enough even new hardware has performance issues, sometimes tied to specific pieces of hardware, sometimes to combinations thereof. That's all fair criticism.