Hmm, I’m not expressing my opinion, these are the statements from the creators of the tools themselves
Krita is a professional FREE and open source painting program. It is made by artists that want to see affordable art tools for everyone.
It IS a painting program, the reason why you can do a lot of the same things that you can in GIMP is because all of those features are useful in both to both painters and editors
GIMP is a multi-tool it can do illustration but it’s focus is more general purpose and more on being an GNU Image Manipulation Program
Again, these are not my opinions, these are objectionable facts taken from the source.
If you disagree with these you are fine to do so, but telling people they are wrong is just ridiculous and looks wilfully ignorant or argumentative