A lot of things, really.

1. Because 90% of online art circles (and really, all media circles in general) have been turned into glorified rat races where everyone is competing for a *like* and nothing more. As such, most art is made to be looked at for 15 seconds, maybe more if you're gooning, and then liked, only for viewers to move on to the next piece.

2. Most of Gen Z has TikTok brainrot and prefer to consume media in quick, bite-sized pieces for a constant supply of dopamine and serotonin. Putting this in an art environment, what you get is lots of users pressing like on your art but NEVER commenting.

3. Most people simply don't have anything interesting to say, nor does most art warrant a comment beyond "this looks great!" or" I love this artist OMG!!", or if you're using rule34 you'll just get a lot of gooner comment and people asking for RPs

It's gotten to the point where if a picture I made that's how I know it's a picture worth being proud of.