Autommatic, Wordpress developers have done this because their main service wordpress.com uses the same feature. Today this feature is very popular if you are doing something more than a personal blog about cats. Nodebb has a ton of examples of how other forum services (like Reddit) were made. Maybe it will be their way too. In any case, I hope that someone will make a plugin that allows you to use one file base and easily manage many forums from one place.
Using NodeBB with custom SQL User database?
I am new to NodeBB and I'm trying to learn as much as I can about how it works behind the scenes. I have a MS-SQL database that runs my entire platform - has anyone run NodeBB using a custom SQL user database like this? If there is an example I could look at I would greatly appreciate it!
If I understand you correct, you don't want to convert your database, but want NodeBB to work with users, that still will be in your existing database (MS-SQL).
It's possible, by creating your own database driver for NodeBB.
But, actually, it's not so easy. If you don't have high skill in programming, it's near to impossible.
has anyone run NodeBB using a custom SQL user database like this?
Maybe, but I never heard about it. You could try to wait for the NodeBB core developers. They, probably, know something, that may helps you.