It really really really needs to fix the topological naming problem. It also needs a UI overhaul and some convenience functionality to knock some of the rougher edges off common workflows. It's possible to do a lot with FreeCAD, so in that sense it's not particularly limited, but it's deeply annoying to have to jump through some of the hoops it puts in your way.
The whole workbench system is shonky, for my money. It ends up with a situation where arbitrary UI context switches are needed to jump from one bit of functionality to another, just because of the historical accident of who worked on which piece of code.
Using the Solvespace solver is an interesting problem: it would switch up the FreeCAD licence from the LGPL to the GPLv3. The FreeCAD folks don't want to do that: it's fine from a licensing point of view, but they don't want the additional constraints.
