Havent played all of those, but think about what made games like New Vegas, Planescape and more recently Disco Elysium great. It wasnt that they blew you away with some new game mechanics. They didnt blow the doors off with some new engine capability. None of the mechanics of any of those games was particularly original. It was all in how they gave it to you.
Even Disco Elysium, which is fantastic and has some incredibly original interpretations of these mechanics, is still basically a point and click adventure game.
The thing is, generally speaking nobody's favorite games did something completely original or new. It's all in how they presented it to you. Think of every classic game and its almost always in some ways a re-iteration of the mechanics of previous games. Even New Vegas didnt really do anything differently than Fallout 3, people just think they did it better.
Doom? Nowadays people could just say "Oh, a reskinned Wolfenstein? Looks like a mod".
Any classic RTS game? "Oh, still gathering resources? Tech trees?"
Something like Prey was a goddamn masterpiece, but if someone wanted to be dismissive they could just say "Oh, this was great when I played it before. When it called Bioshock".
Any survival horror game? "Oh, more large shadowy rooms and the occasional monster to break the atmosphere of tension BORING". Callisto Protocol literally looks like a Dead Space remake, but people are completely happy with that.
Party based RPG? "More experience. More gaining levels. More classes"
In the words of the Barenacked Ladies, it's all been done. All of it. Theres rarely anything new under the sun when it comes to these games except the packaging. But, more importantly, when people look at their favorite games, just like when they look at their favorite movie, they rarely break any molds. But they put it all together in a fantastic way.
