Hey Steph,
Feature : Let’s give the user the option to sculpt on the low poly while viewing the high poly.
Use-case : When using the move or drag tool we usually switch to a low level to avoid bumps.
There could be a triangle above the subdivision bar. While moving that triangle, a ghosting of that level will be overlayed on top of the high-poly.
Additional thoughts : There could also be an option to display the low-mesh cage while sculpting with unique color selection.