Ok, I'll take the bait ... what would happen if you had either a total hydraulic failure and/or a total systems failure? Obviously you'd need to get back onto the ground asap - but surely if you have a situation where the gear might collapse and/or a brake fire break out (as happened with the Transat aircraft) then surely a full fuel load would make life rather interesting?
And, if your position is that dumping fuel is a waste of time and money - why is it that airliners have dump systems?
I'm not trying to score points here - I'm genuinely puzzled as to why Airbus think they don't need something everyone else does!