High self-esteem.

SAI seems simple to me. I switched to it from Photoshop a long time ago because it allows you to mix colors on a canvas, which is very difficult to do in Photoshop without a lot of hassle. But when SAI started acting up and glitching, I began looking for another program, and Krita turned out to be a lifesaver. It has very similar brushes and functionality, but at the same time, it has a hundred times more settings and tools.