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One aspect that helps with having a good balance is to have an enough number of users that help newbies ask good (or at least decent) questions. This is something reachable within rather small communities.

I have seen this being put in practice by [Politics.SE](https://politics.stackexchange.com/) where there is a more effort put into helping users rather than simply downvoting and/or closing questions or deleting content:

- editing lousy questions in good-enough ones whenever possible. It provides quite some satisfaction to see a negative score question becoming a "hot" one after being edited.
- providing constructive criticism through comments rather than simply downvoting / vote to close.
- use comments to argue against closing or downvoting a question by providing arguments for this. 
- have a clear and concise (minimal) set of rules [like Codidact has](https://github.com/codidact/core/wiki/Codidact-Code-of-Conduct). 
- remove content that blatantly goes against "Be nice" policy.

**This is clearly possible for Codidact communities.**

I think it is important to avoid having "maximizing number of users" as the main goal of any community. It is important that they feel welcomed and in the same time to understand that not every community is a good fit for any user.