That would be spending time and resources to create a solution that per default wouldn't help AT ALL. The purpose of such functionality would be to punish people who create new accounts to troll. What do you think these people did before they created these new accounts, sit quietly and read and thinking 'this is not yet a forum i want to be a part of, not until i find a good way to troll it'?

Moderation is done in oh so many different ways in different communities, but to set a "this account is less usable than what you get if you create a new account instead" flag on accounts, only has one forseeable effect.