Im all for the lighter weights for reactive combinations that just seem to happen with that type of speed; There is no room for planing and many great things happen straight off the cuff.ITs where the learning ground to what can and cant be done is seen.

I think there is more room for advanced technical footwork within in the heavyweight division so as to utilize weight for and against ;specially fighting on the inside or to evade or make use of the inevitable clinches.They could easily train to make the others strengths turn against themselves and use balance for and against, if studdied correctly.

All that said: I recon the welter and middle have the best of both worlds; they can and do utilize things from both the extremes.
They have more control as they are comming out of the natural balance between the extremes so they can utilize nearly all the moves from both sides and so can be more technical about their approach.

Did I pass