What about the Machlokes about how long it takes for Yetziras Havlad. They tried bringing proof from incidents but they were discredited.
I had a Pshat for that one too, but I’m not so sure you need one. Where does this rule come from that they cannot argue about a Metzius? True, they can’t be arguing on a Metzius that they could have easily checked out.
The Pshat you gave implies a very general Machlokes. I’m not so sure you really want to take it there.