One thing that has always bothered me about the Austrian UA (which I don't see in the notes) is that CS which are married into the Austrian Empire lose their status as CS. In every other game mechanic involving CS, they are treated like capitals. Chief among this is that they cannot be razed no matter how many times they change hands.
Now enter Austria and its broken UA. Once Austria marries a CS, it ceases to be a CS. When a player is at war with Austria, they are free to burn all these former CS to the ground. The cannot, under any circumstances, liberate these CS either.
I would like to see CS absorbed into Austria remain CS for game mechanics reasons. They would get them with all of the buildings intact and without the
penalty of a conquered city, bot for all other intents and purposes they would be treated like a conquered CS. When another player rolls up with an invasion force, they should be given the option to liberate CS from Austria, and should not under any circumstances be allowed to raze said CS to the ground.
At the very least, this would introduce a compelling reason for a player to DOW Austria for taking one of its CS. They could liberate their CS ally. As it is now, they can only overthrow the Austria friendly government from the former CS and then choose to annex or burn their former CS ally which seems out of place.