I use the mma style for bag work, but I ALWAYS have wraps on. I use my 16oz gloves too, but they don't fit in my gear bag well, so I ususally reserve them for sparring nights.
I actually had a teacher, a savate teacher at Concordia in Montreal say wraps are for poseurs.
I came too 1st class, with my hand wrapped, mouth piece and all that. There was only one other experienced kickboxer there, and he had wraps too. One of the new students asked about them,and the teacher said that "they;re detrimental. They don't allow your hands to get stronger and the only reason we ware them is to look cool".
Fuckin dick.
Of course, theres all these newbs hitting a 200 lb bag and coming to class the next days complaining of sore wrists, knuckles etc. All of them except me and the other guy. And of course jack-ass just told them to suck it up, even though there were probably a few with real concerns for their health.