I do.
If I'm lord of a city region, I'd like to be able to be given a chance to stop it at least. Perhaps a 1 turn warning.
Something like drop all of the control and loyalty stats to nothing, but still give the lord a chance to prevent it (OR to pay off the rebels to prevent it) in some manner. Otherwise, it is kind of dumb.
You can always deal with rebels when they start to protest, usually it's about a day or two even with 100% against you. See all the brutal takeovers of regions where there is 0% sympathy and 100% independence.
