I say again, hearing isn't an issue. Properly fitted earplugs take care of that. Discomfort of helmets is definitely an issue. Even if they weigh next to nothing, the wearing of anything close-fitting around the head creates extra heat and for people like me, that means sweating and itching.
Discomfort of any kind increases fatigue, so I would be campaigning for a further reduction in flying and duty hours a la the reductions we already have to compensate for wearing immersion suits.
We would also need to take mandatory breaks of at least one hour between flights, such as my company already allows after 4.5 hours in immersion suits.
Fatigue increases risk and no doubt our passengers would be interested to know that many pilots will feel more fatigued while wearing irritating and distracting helmets during ARAs, etc.