There will be a constant movement towards improving the technology, I don’t think it’s a problem that the balls are lighter than they used to be, for example.

I think the only real issue is understanding what the target is.

Are lighter and lighter balls better? Probably only to a point.
Are rounder balls better? Well we found that isn’t the case with the Jabulani.
What makes a football better is subjective, as a faster ball may be worse for keepers but better for free kicks, or whatever.