It's a little bit disconcerting. In truth I doubt the AI will ever develop to those kinds of levels but based on what I saw in 1.12, I wouldn't be surprised if it occasionally exceeded 80-100 in a few places. Meanwhile, cities of the likes of Paris, Wien, London, Prague, and Istanbul will remain at less than half, because the AI is spending points elsewhere. Exactly the opposite of what could happen IRL.
Some people seem to think this sort of thing is okay, like they probably wouldn't care if Norway was converting to Sunni every game, the Aztecs conquering the HRE, and Circassia colonising Canada in 1470. Because what these mechanics will potentially create makes about as much sense as those anomalies would.
Don't get me wrong, I like development in principle, but I'm really worried about how Europe is going to look. We do need soft caps of some sort and a still smarter formula. Europe is going to look pretty ridiculous otherwise. Playing 'tall' and developing a group of provinces as opposed to wide blobbing is great as a principle, but at what cost to historical plausibility when you put no restraints on it?