Agree that carrying AX8 is an advantage over carrying AXE 2 or regular rig of amps and pedals. But why should it be just advantage if it could be GREAT advantage ? Why are you not looking even beyond that ? AX8 is not the only thing you take with on rehearsal or gig. You still carry your guitar in a case, then AX8, then clothing, then wireless monitor system, cables etc etc etc. Overall mass of everything you carry is still quite big. So, the lower weight of everything, including AX8 - the better. Or are you happy when you move a lot of mass with you and become tired and sweaty before the gig ? Looks really like masochism. And then you can not go for a walk with your friends after the show because "oh, my rig is really heavy, I will stay here...".
If there are such "weight fans" - I think Apple should release the iPhone which weights about 10 lbs. So much pleasure to move it with you everywhere.