Andre Klapper commented:
Specifically MediaWiki is great if you’re creating an encyclopedia but less so for anything else1
Supported is also questionable as from my experience they are not really interested in helping with anything that doesn’t fit the Wikipedia use case
@afranke: Do you have experience with MoinMoin support (maintainers, community) to compare to? Which kind of non-encyclopedia MW use do you refer to? I'm wondering what exactly your judgement is based on.