FWIW I agree that undo is broken — I don't think FreeCAD has a single global undo, rather one that works differently in Sketcher.

Could be wrong but the top-level undo does weird things when there's a recent change in Sketcher.

And yeah, I now use Spreadsheet as little as possible. There is some work going on to try to resolve Sketcher's aggressive recomputation problems. Pop into the (ugh) Discord sometime, there's a channel about it.

Configuration Tables, though, are a really powerful part of Sketcher, particularly when combined with app link variants.

In terms of dependency resolving, the core VarSets are much, much better, and in 1.1 they are better integrated into the expression editor, so you can store an expression as a VarSet property without leaving the expression editor.