Horses for courses.
We sometimes wear flotation suits and the recommendation from Fladen is 275N jackets.
We sometimes wear drysuits and people have drowned feet up, answer 275N jacket.
We operate sometimes quite far from help in sometimes rough water, again 275N jacket.
Both of ours are fitted with lights, sprayhoods,crotch straps, knifes and mine with an EPIRB. They are worn all the unless we are diving and wearing drysuits. Anybody on the boat has some sort of BJ on or they don't get on, its the boat rules and its my boat so there! Even the dog needs to wear one, it doesn't feel bulky as per the pic
I don't find it uncomfortable or heavy at all, its just part of using the boat. I don't perceive an issue getting back into the RIB either, its something we do a lot diving. In fact I once managed to get a set of twin twelve Lt cylinders, weightbelt and a flooded drysuit into a RIB.
If I was having difficulty getting in because of the jacket and I had a hold of a lifeline I would just deflate the jacket a little?
However if I do fall overboard lots of bouyancy would be welcome, especially if its rough!