If Airbus tested and published in the procedures (as it looks like in my manuals in both happenings approaching and exceeding VMO / MMO) this should not lead to personal aurguable judgment (even if based on some knowledge) that would bring only discussion in the cockpit in such a high workload and dynamic situation.
Otherwise we should start now to bring into the discussion the MACH divergence drag number and drop in Cl over Mcrit speed and we would not get out of it anymore.
I like to try to understand always the theory and principles behind any procedures, but as long as they fit and i´m in a healthy plane (not like the one of AF447) i would not willfully disregard any procedures that Airbus tested and reported.