The only positive from this is that two wrongs have accidentally made a right.
1st Wrong: You drop uber% on death.
2nd Wrong: You can't change weapons except in a clumsy retarded way.
The Right: it's actually quite hard to take two mediguns with you over any distance. This means that to use 2 ubers you have to use the first one in, trade ubers, then retreat back to your other medigun and use in again. It's perfectly viable and actually might prevent this snowballing we're talking about, but in some situations it means it's better to stalemate and build 2 ubers instead of pushing with a small advantage on 1 uber. What a time to be alive.