The manufacturer has provided it with some purpose. Ignorance of flight control system in FBW is not good. In alternate 1 with manual thrust if you happen to drop speed the aircraft will pitch down below VLs while in Alt2 it will keep loosing speed and keep trimming all the way to stall. In A330 In roll there is protection in Alt1 but not in Alternate 2. The worst thing if someone didn't bother to read in years and this professionalism then why waste time asking any thing on PPRUNE? Better to enjoy a movie.