I've only ever used Krita, really. What features am I missing from photoshop? What is that gulf that I do not see?
1. Photoshop has a much better template and smart referencing system
2. Photoshop has better photo retouching tools in the form of healing or switching working spaces to tune filters.
3. Photoshop has better image manipulation tools like warping and perspective correction
I do really like Krita, and I’ve replaced Photoshop use for illustrative use cases for several studios and individuals with it. So it really depends what you do, but Photoshop just has a lot of little and big things that add up which prevents me switching myself.
Photoshop is a great painting app that rivals krita for painting. That it does other things well or originated for just photo editing doesn’t take away from that.