I use GIMP a lot and learning the interface was hell, but other than that it’s perfectly good software. Haven’t dabbled much with Krita, but I’ve heard from colleagues it’s pretty great.

Main issue is what the other user pointed out, if you work at a company you need to either use locked in software or somehow convince the whole company to use the foss version. Nowadays lots of people are using Canva despite it also being shit and increasingly enshittified.