The old protrusion tool was awesome for extruding profiles off solids but the new one doesn't offer a blind extrusion option to allow it's usage in this way. It seems to only work by extruding between or up topre-existing solids which severally limits its usefulness.

Also in V8i feature modeling we had a boss tool which was kinda like a inverted hole you could just add acylinder to a solid and quickly constrain it. I would love this boss tool to come back and support primitive shapes like, cone, cylinder, block etc. This would make adding simple features onto pre-existing solids easier.