I guess I didn't fully realize the implications of the MSRV policy when you brought it up, I think stable minus two is much simpler to manage. Or maybe we just adopt set the MSRV required by our dependencies (the status quo).

Also, do we think/know of anyone using mwbot-rs with old Rust versions? My impression is that most people just use the latest stable compiler.

I don't think we need to support that old rustc either. The current MSRV Policy is what I set up anyway.
I just wanted explicit criteria to figure out how far and what to include in the dependency. If it's "up to the rustc version that the dependency requires," that's fine.