Those who need to work (a lot of us) are those who don't have someone paying their bills and don't have an easy/fun/passive way of getting money, like a lifestyle business, fun job, fame, or inheritance.
So is work necessary? Probably not. But hobbies, creativity, production, and innovation will probably always exist because it's what people do naturally. I think there's a system in which everyone is having a better time overall, where we wouldn't call it work. But we're not there yet - we're still in a post-feudal system and will continue to see leftovers of that for some time which affects a lot of people and makes their lives unnecessarily difficult.
How do you see strict Socialism where everybody contributes as much as the can and get whatever they need (my improvised interpretation).