I'm not a power user, but I want my tablet to work (DisplayLink on Linux is dodgy, though I did eventually get it to work--not Krita's fault but Linux in general remains a mess with hardware at times) and I want to be able to combine filter effects and behaviors with painting--and Krita has trouble with that. It is a good-not-great program (I even gave them money for it!) but it's not a Photoshop alternative unless the subset you need is pretty restricted.

(The mess that is Krita/GIMP interop makes it a non-starter, IMO.)