Goldenrivett,
Indeed, the PFC switch is in an equivalent position to the ADR buttons in the A320/330. However, the point is that the Boeing would not have been preventing an over speed in an upset such as the one I mentioned and might have exceeded VD regardless of the status of the flight control system. Therefore, the use and effect of operating that switch in the protection regime is very different. This is a philosophical difference between Airbus and Boeing that has been thrashed around for years on this forum and elsewhere.
However, the 'protection' and 'limitation' terms are misnomers. Both designs provide protection In different forms, but the Airbus does not limit the operational flight envelope (despite what some here might say!)
Whilst I'd love a go in the 777/787 for comparison (although I've flown the sim and tried the protections), I remain to be convinced that it's superior to my 'Bus!