For me, it's because I'm busy. I can't waste time grinding for hours on end anymore because I'd like to get through a game in a reasonable amount of time. But even if i never grinded in a game, that can be hard to do with work.

Now with FFVIII, I could grind forever honestly. Just playing the game itself is relaxing/a stress reliever for me. I've just sat down and fought monsters for hours on end in that game while talking with friends or doing other things just because playing it helps calm my nerves.