The current icons are not clear, and not distinctive enough.
Mt proposal for better icons:
Before
After
I always need to wait for the explaining help text to find out which button is for Render Marked Takes.
My proposal for a better icon:
Deformers have a button 'Fit to Parent', which copies the dimensions of the Deformer's parent to the deformer's dimensions, so it exactly fits the geometry that it is going to deform.
Deformer can also work next to the geometry, on the same hierarchy level. But in that case 'Fit to Parent' makes no sense, and doesn’t work. In that case 'Fit to Sibling' (sibling = bother/sister) should be nice. Or better - an intelligent function that is called 'Fit to Geometry', which fits the Deformer to the affected geometry in all cases.