Well, this isn't about 13lb bikes, it was simply about shaving a pound or so off with wheels. (again, made negligible by any number of things you eat, don't crap, carry in your pocket, on your bars, in your bottles, etc.)
And if all we do is climb, accelerate, and go at speed (whatever that speed may be). Then what in the world else is there to feel in a bike......eh eh....wait for it.....that would have to do with WEIGHT?
FWIW, I've ridden a 14lb carbon full-race beast that was (well, "felt") quick off the line, but so does my 25lb hybrid when I take off in 28/28.
And as has been proven ad nauseum here and virtually every other place on the internet.....it doesn't matter where the weight is added or taken away.....it *is* the same. Nobody likes to hear that and I'm about 99.9% sure it's the reason we're all looking to lighten our bikes by less than 10% despite that net result being probably less than 1% of the total weight package.
But I'm also still not hearing a good argument for what a lighter wheelset gains us.