I think if someone does have to change a large portion of their robot, then their opponents must be told, and they must have a say in it. For me, I'd have no real problems with someone changing the frame, or the drive or something of their robot.. so long as its within reason, not just taking the RX out of your wegdebot and putting it into a spinner and calling it the same robot
That is just me, and of course others will have different views.