I can't tell you how many times I've been retreating a tank or chasing someone down and got stuck on a tiny lump.
No matter the slopemode they'll get stuck on tight or sharp vertical clifs. The 'bouncy physics' pathing for buildings is stupid (it can also change or cut velocity), proper obstacle detection and avoidance is needed.
If you look at everything kloot posts and references, all his test scenarios, it's shit like this:
That's cute and all, but is not that much of a serious situation. If you can't avoid bloody cliffs and have to bouncy off of buildings, these is the basics of what pathfinding has to do and Kloot just ignores it and says it is fine because his text scenario looks pretty.