I’ve hill walked a few times in winter with people carrying very small packs, proud of their ability to travel light and dismissive of the ones carrying “loads of stuff that’s not needed”. And the large majority of times the worst they suffer is maybe getting a bit too chilly.
But, and this is a big but if something were to go wrong, a broken ankle, a misjudgement in distance, anything leading to the situation where a night on a winter mountain was necessary, it’s the poor sods who lug the safety equipment about who would be the ones who would keep the group alive.
I’ve had people say to me “oh you’d just have to leave me in the open, it’s a chance I’ll take” but on the rare occasion we have run into trouble they are always happy to borrow that warm jacket or extra gloves that they themselves weren’t willing to carry. And they know that in an emergency no one would ever actually leave them out in the open to die.