It’s on by default, and should be for performance reasons.
That’s the point. The system is a giant footgun as it is. You can use it correctly - but nothing tells you that it’s going to call your functions from worker threads - and a lot of users probably won’t even know what that means, why it’s a problem, or how to deal with it.
If your game supports modding, this issue becomes elevated from a fun bug to a critical security hole.