I'm not sure what it is on my machine(s), but I've found Pinta to be very unstable. It'll crash to desktop without warning in the middle of random operations. If it would just work reliably it's the paint app I want to use.
There have been issues with the packaging of the app. I can't remember precisely, but I do remember some crashes due to mismatches of some expected library version in Debian family. I'm using the version on Flathub which seems to work, and while I dislike some of the recent UI decisions like the ColorPicker is now worse (apparently enforced on them via GTK changes), I do still like Pinta.
