I thought that the whole idea of manouvre demand was that, if you don't demand manoeuvre, then it won't manoeuvre?
Why go against the FCOM? Surely the manufacturer's advice is more appropriate than " 'cos that's what we did on the 707"!.....
A different question - is the A321 more demanding to land than the A320 or A319? The reason I ask is that, as SLF, I've suffered 2 bone-jarring 'arrivals' courtesy of Lufthansa in A321s but never in the 300, 319, 320, CRJ or 737!