There's more to the story, it seems. But I do not know the people involved in person, nor do I want to rely on hearsay and speculations, so discussing matters like these generally leads to more speculation in the best case, and tin-hat wearing conspiracy tales at the worst.
What I do know for a fact is that another developer (Joe Eager) began work on improving the Sculpt functions in Blender a while ago, and that he intends to (finally!!!) add sculpt layers and VDM (Vector Displacement Mapping).
He's already implemented hard face set boundaries for Dyntopo sculpting, and just the other day presented a new extrude tool in sculpt mode. Some demos (more on his channel):