I’m not sure if I should be posting here since the devs are definitely working on making a nice UI, but I’ll put my suggestions here so that people can see them
I propose that Krita takes a similar approach to Procreate by minimizing the dockers and menus using buttons/tabs. (disclaimer: I have not used Procreate before since I do not have an iPad, I am going off art process videos on YouTube)
Here are some (shabbily made) mockups for the concept:
I think modifications to the existing Canvas-Only mode will be enough to implement this, but I’m not sure since I’m not a coder.
Also, to (somewhat) combat the need for a keyboard even when on a tablet, I found a solution in Clip Studio Paint. There is a round draggable button that toggles a menu similar to the hotkeys on an older Wacom tablet. Tapping one of the modifier keys toggles it rather that a temporary press.
I also saw the Windows application Tablet Pro, and I think an implementation similar to that would be good (maybe modifier keys, some letter and number keys that can be customized by the user, and basic actions such as Undo, Redo etc.