Ok, maybe I over reacted as well...

Now how about some serious answers?

One kilo extra added to a weight diff between horses all up of 20 kg? Does that REALLY translates into, say, 1.5 lengths, or whatever, depending on race distance?

Is it not a pipe dream in reality, and only effective where all else really are the same? It cannot be that effective in a field of 18 runners- sometimes a horse wins with top weight; sometimes they do not place.

I can only see it as helpful in the sense that somebody who should know, thinks the horse is top of the heap for eg.

It would be interesting to look at stats regarding allotted weights carried and total(horse and rider) weights; or has it been done?

If I was a trainer, a rated horse would exercise with a heavy rider anyway...