The difference being that to paint a robot red doesnt mean it weighs more or needs to allocate propertionally more weight to a specifically aspect of the design

I dont think 10kg is enough to unbalance a robot really - you could do light tracks, but in doing so you end up with something so flimsy youd be better off leaving the 10kg bonus and just havign wheels for the trouble it causes.

Perhaps when there is a tracked vapour out there that is managing to abuse the weight then Ill review my own policies, but as no one has managed to do it yet I dont see any reason to change it.