If for no other reason than the fact that you haven't attempted it and therefore don't actually know.
After that, the next level of karmic adjustment is to refrain from posting bad reviews of restaurants.
I don’t need to have attempted any of those things to know that what I experienced was sub-par. I’ve heard better singers, seen better movies, and read better books.
If what you said were true, only movie directors would be able to criticize movies. That’s not helpful.
At some point the criticism isn't just useless, it's spiteful and just an excuse to get in your own soapbox. That's why the stereotypical Karen isn't exactly praised for their "criticisms". If they left it at "this steak is done and I wanted medium rare", such stereotypes wouldn't exist.
I see gps sentiment more often than I can understand, and it horrifies me. Especially as regards creative mediums (music, art, etc) where the point is to entertain. I may not know exactly what's wrong with a work, but I'm obviously qualified to critique it.
But even in other areas. It's easier to tell if something is good than to make a good thing. With a limited number of exceptions, I can tell if something someone did is crappy or not with a fairly limited understanding of their field.