> If something is not in scope for your responsibility, obviously you must ask for permission.

Agree, but this can often be blurry.

> If it's in some weird edge case where you "feel" it is "in scope for your position" but you "want a bit of reassurance", then pick a lane.

I disagree here. I think there are often cases where this really functions as an "FYI" and is helpful. You are not shifting responsibility to the other party, but do...

* CYA if they say they weren't informed

* Get an opportunity for feedback without stalling progress in the case that they don't respond