Client only way to limit the number of resources a user can create

Hi, did anyone figure out a creative way to limit the amount of resources (collection documents) a user can create?

I am trying to avoid proxying document creation through functions that are called from a client if possible. If there’s no other way sure.

How many documents do you want the users to be able to create ? A hacky way would be to maintain the number user has in users profile collection n restrict user from creating documents if it reaches the threshold till user deletes some.

I think function will be the best option, why would you want to avoid a function?