I’m not sure if it’s been mentioned, but the Krita interface is very flexible - you can add/remove elements and move things around to suit your needs. If you look at this thread for example you’ll see how different people’s setups are.
There’s a ‘canvas only’ mode (press Tab to toggle on/off) which maximises the available painting area, and you can choose what elements remain visible (via Settings > Configure Krita > Canvas Only Settings).
In the brush presets docker you can create tags to isolate the brushes you like - so when you select it in the drop-down menu, you’ll only see those brushes you added that tag to.
You also have the option to add python plugins to tailor the interface further. That’s more complicated, but enables creating a very minimalist setup if you know what you’re doing.
I think it’s worth persevering if you can as it’s such a flexible and powerful program. I say that as someone who used mypaint for many years; I used to like if for sketching and blending, but Krita has evolved so much that Mypaint is effectively redundant for me now.