I feel like nostalgia plays a big part in this, and I'm very outdated when it comes to modern games, but... In the previous game eras every game used to look and feel so different from each other, because of unique art styles, themes and concepts. And you'd see many companies making their own engines for different titles, so each game was unique. And everyone was coming up with new ideas and concepts so you had this great variety of genres and themes.
But nowadays most companies are following the trends, so you end up with many titles that end up looking and feeling the same, you don't see people going for a genre that hasn't been touched in a while, and once someone does and gets successful, you get bombarded with the same stuff again from everyone else trying to be "in".
The use of modern game engines really helps developers, and they are pretty flexible to how you can make your game look and feel, but most often you see the hyper realistic graphics and over the shoulder camera gameplay, or since Genshin came out you see open-world walk-around-collecting-and-killing-stuff with anime-esque graphics.
Anyways, this whole rant was to bring the point that in old days you felt like you had a great variety. Sure, during the SNES era for example, you had tons of JRPGS and platformers, but they all felt and looked so different from each other, it all felt new instead of feeling like just another copy of the most recent successful game. So I suppose that could be one of the reasons a lot of people still like old games, even with their limited technology and clunkiness.