I'm not saying that this issue doesn't need tweaking or that it's not extreme, but I consider other issues that have been there since Day 1 to be more important and those never got resolved.
I'm not saying the change to AI, thus undermining, is extreme and needs "fixed" yet. But this week has seen all the Hudson undermining merits get moved to their expansion, they are over 1.8 million merits in it right now.
Thats around a million undermining merits that haven't hit anyone, probably most of it would be Mahon.
If this is actually how things will be from now on, I think the undermining/fortification balance is shattered, which is far worse than anything else wrong with PP (excluding not allowing Delaine and Antal to expand)
The AI change certainly buffs the trading expansion powers, maybe even more than after the Cutter was introduced along with unlimited cr from Robigo.