That would avoid several issues:
a) as an OPM you ate 2 OPMS. France, Austria, Burgundy join coalition. Coalition war. You are DEAD.
b) as burgundy you allied England and Castille, beat the shit out of france. No AE for either england or castille. You beat the shit again. Again no AE. Finally, when you annexed 2/3 of the area castille breaks alliance, england still happy. WTF? a superpower just died and the only important country to care was austria and savoy? nonsense
c) as france you eat and OPM. one province? who cares? no one? while it should immediately rile EVERYONE in the "regional powers" legue and cause a coalition (a big guy beating kids is not nice, not nice at all!!!)
d) as a opm, you become a 10P(not so minor). the regional league hates you, however, the Great Powers also notice you. Any additional moves and you should have both great powers and minors at your throat, upstart.
One day later if your changes are done...
Example of thread title: OMG one province causes coalition?!?! WTF Paradox U playing with fire
Besides please - don´t use hyperbole. Everyone who played the game knows your "OPM eats 2 OPM and gets coalition of France + Áustria" of the example you used doesn´t happen. And from what I´m seeing in my 1.6.1 game coalitions are almost NEVER na issue. Too early to tell, but maybe AE is indeed too low.
On the other hand since the AI really hates players which have claims or cores, maybe even intrinsic diplomatic mechanisms will make the AI more agressive. Got 3 provinces which Muscowy had claims and despite being allied with me they instantly dissolved the aliance.