My thought is that it shouldn't be crippling, as roaming armies are fun as an idea, but ideally it should make running around with max number and limit of MAA a skilled balancing act, rather than a foregone conclusion.

Do with this concept whatever you want.

First of all, these mods are amazing, and thank you for improving the game with all your stuff. I've added basically all of your stuff to my current run and am very pleased so far.

Secondly, in the process of finding these mods, I ran across a very interesting proposal, and since you seem both capable of and interested in this section of CK3, I thought I'd toss it your way.

The idea is thus: MAA and followers should use provisions as upkeep. Currently, Adventurer MAA are relatively free in terms of passive impact on a player - you can just park 5k units in a province indefinitely and not even bother with quests. Giving MAA an upkeep would (a) make provisions an interesting mechanic in late-game adventuring, (b) add a sense of urgency that would keep players moving around, and (c) punish players for dragging around massive armies.