Lack of anonymity hasn’t stopped middle-school and high-school bullies since even before the internet. Some people don’t grow out of that kind of behaviour.
Such a system is conceivable, but it’s not one I would wish for. I’m not the type of person that wants to be like a famous Twitter user. I’ll make my contributions to this platform under my pseudonym, thank you. With some effort you could probably sleuth enough to find, dox or stalk me, but why waste your time to be an annoying wretch of a person to do that? Having real linked IDs would make these issues worse.