Leo - while you might not mind weight differences, everyone else would. The goal is that everyone in robot combat uses the same rules, same weight classes, etc. It improves understanding and increases the likelihood of croos-continent competitions.

As for why the given classes change - its so that they are all even intergers in both Kg and Lbs. Makes it easy to read and understand. If I had my way, the US would go metric and so would all weight classes - but thats just not gonig to happen, so I view this as teh best comprimise on weights, and a good start to standardizing the sport world-wide.