I still don't know why teams in Battlebots use drones - the only useable thing you can mount on them is a flamethrower, and they're useless anyway unless the opponent's made of fur or paper. As for clusters and walkers, yeah I'd say some rule change would be nice to make them properly viable - we hardly ever see them unless you count the various minibots on RW this year which seemed more just like something to do with the extra weight.