The aesthetic problem w/ a center vent is that when it opens due to the natural/quotidian movements of a man (i.e., man puts hands in pockets, man crosses arms, man genuflects before an altar, etc., etc.) the split in the rear center vent reveals a man's most inelegant feature: his ASS.
Who, after all, wants to look at your ass.
The same aesthetic problem, of course, does not apply to the fairer sex because a lady's bottom is - aesthetically speaking - well, an attractive asset. A good thing.
Not so, thankfully, w/ men. This is why most gentlemen of taste and discrimination (i.e., good sense) prefer either the double or ventless jacket, since is tends to flatter a man's more attractive assets (shoulders, waist) while de-emphasizing his least attractive qualities, i.e., his ASS.
Think about... But not too much.