I think people just feel that the software is not for them. Krita always markets itself as a painting tool for artists, never mentioning image editing. For example, take the first paragraph that you can come across their website:

"Krita is a professional FREE and open source painting program. It is made by artists that want to see affordable art tools for everyone.

- concept art

- texture and matte painters

- illustrations and comics"

I'm not in the business of either, so why would I get the idea of installing it?