If you have done HUET training then you would Know that a helmet and a STASS bottle would not encumber U on exiting a cockpit(women and pilots first.) But apart from the limited protection from banging your head, wouldn't a good quality pair of headsets protect your hearing! Having worn a helmet in the Military for many years it was such a relief to fly with headsets in all enviroments. I think it should be an individual choice.
What ever makes you happy!!!!!!!