I'd say its because of the age really. Alot of the titles that add to multiple stats are in the historically war-torn provinces or seats of powers for various Kings. It does certainly make pumping up a general easier however. Though even with that I didn't get a 6 star general until recently, he still has a spot open to rule a province so i'm thinking of bringing him up to 7 stars.

Got kinda off track, but in a roundabout way I meant to say its probably also because of the weaker generals everyone seems to get. I've seen maybe two 6 star+ generals. Though this might be because of the green generals command line more then a change in VI. Its hard to build up any uber-general over time unlike in M:TW. If only the popups about their deaths would display correctly.