You think DLSS support affects the game rating? Clearly you missed the point about game "technicality"
And no, having a 5/5 score for a perfect game (or close to perfect at least which is possible) is indeed a correct way to judge a game, let's take this one for example, the fetish is femdom, ok, does it allow you to perform all possible femdom actions? Does it have say full range of CBT interactions? Does the game feature cock cages, sounding, ball busting? Or is it just one narrow aspect, like leg hold/chokes? If so, it doesn't cover all ranges of femdom aspects, thus already does only cater to one narrow aspect, but you may say, ok, I only like this one narrow specific, and in this regard it's perfect, to that I say, no, it's not, becuase it still does not do this aspect perfectly. For example models, maybe someone would prefer more realism, to that you say, no but I only like, low quality, low poly, flatly shaded Genshin Impact models.
This is no longer an objective rating, you are removing all factors that could influence the games rating until you end up with the few things you like about it and ignore everything it does not do or does badly to justify the game's high rating just because you like it.
That's not how you score a game.