Posting here rather than in the Diet, because my arguments are entirely OOC.

I think the PBM will suffer if we commit to a fair allocation of territories at all times. If we remove the ability of Houses to influence their own expansion, we're essentially taking away any competition between the Houses. I think that would dull the game down a great deal and make for far less interesting political intercourse. A game in which better strategy and deal-making results in more power for a House will keep people interested and interacting for far longer.