Two points I brought up in the prior topic that I think are worth mentioning again:
First, I personally like how Blender has the toolbar tied to the side of the viewport, and it can be hidden/revealed with a quick keypress (though I think the on-screen toggle for this could be much clearer in Blender). It’s such an integral part to the software that its worth keeping close at hand at all times, but a lot of it can be navigated with keyboard shortcuts as well so it doesn’t need to be visible all the time.
A big part this is converting the toolbox from being a docker into being something floating on top the canvas area in a fixed position relative to the side of the canvas (though it could be wise to allow options for left side/right side, or even top/bottom).
Second, something Blender likes to utilize is a context sensitive UI. When you’re in Sculpt-mode, the toolbox switches to sculpting tools. When in Modelling-mode, the toolbox contains tools for 3D modelling. While Krita doesn’t have “modes” in the same way, it definitely think this could be worth looking into with regards to the type of layer a user is currently on.
For example, when you’re working with a File Layer it might be worth hiding the tools that can’t be utilized on such a layer (brushes, shapes, etc). This idea could also probably be applied to the Tool Options docker (this is already context sensitive! ) and/or the main toolbar, where things might change name (from ‘size’ on Paint Layers to ‘line weight’ on Vector Layers) or get hidden/revealed depending on if they’re useful for current type of layer (afaik you can’t utilize Eraser Mode on Vector Layers, so maybe the button on the toolbar should be hidden in favour of other.
Hiding/revealing buttons and tools based on context would have to be weighed against something Krita already does with some tools, like the text tool or calligraphy tool, where the software creates a new layer of the correct type for you. Doing something like automatically adding a Transform Mask to a File Layer if the user applies a transformation might be worthwhile doing. The Calligraphy Tool on the other hand might be better off if user had to be more explicit with using on a vector layer (or maybe just merged with the Freehand Path Tool instead). Text Tool is more of a grey are for me personally. I think of it specifically as a Vector Tool, but I can definitely imagine newer users just wanting access to it at all times.