Most of the games I play on Linux very much benefit from a beefy GPU. I'm currently playing Hitman (2016), which may not be the most graphically intense game ever, but it certainly looks great with the right hardware. I could run it on my laptop with on-board Intel GPU, but it would look like crap and lag.

We do get our share of AAA titles, just not as many as on Windows. As it is, there are more appealing titles than I can ever play without cutting into work, chores, or (non-gaming) leisure time.

Most indie games benefit as well though; even though these do tend to work on less well-endowed GPU's, they simply look better with a heftier graphics card. I've got a desktop computer with beefy GPU exactly because I enjoy gaming; and it runs Linux, exclusively.