It is a bit pedantic in my opinion, but if anyone has any references it would be greatly appreciated.
The best reference I could think of is the minimum rate of climb and descent requirements. But those are a bit academic and I can think of a dozen scenarios where it'd be prudent not to congest a busy frequency with that.
I know you're just looking for answers, but to me we are trying to solve a problem that doesn't exist. Typical pilot stuff to do.