I have an idea called Mask Groups it will be like Vertex Groups like in blender instead of making a new feature just add upon one you already have.
The mask groups should be as flexible as the mask tool and should work like vertex groups it will be faster than clicking on vertices just not as precise, but that should not be a problem with quality and the sharpness button.
Should also make the default shape quality high enough for fine line masking and painting or just high enough for your device.
I’m using a old poop iPad so I probably won’t even be able to use the new feature sadly.