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I'm not so sure. In running (as a more direct example without aero/stiffness etc. confusing matters), I find 2-3kg can make the difference between me feeling **** and me getting on the podium in races. And wearing a backpack that isn't very heavy - a few kgs at most - slows me down massively.
So I think, given we're each so finely calibrated to moving our own exact mass around, that relatively small differences in equipment weight can actually be significant.
Looking at it another way. Dropping from 70-68kg is like dropping 2.5% of your weight and even if you did, it would be gradual so you'd never feel the difference, but try running or cycling with 20-25kg (25% of your weight) load on your back for 2 weeks and then get rid of it. You'd instantly feel the difference. Similarly, my commuter and my roadbike are both gravel bikes and after riding the commuter, with lights, racks, tools, etc for a week and then getting on my roadbike, it instantly feels faster to accelerate despite only having 1kg between them at dry weight and possibly 2-2.5kg with all the bits.
the 2kg extra doesn't really limit you, but it also doesn't encourage you like a light feeling bike does. It's just somehow more fun.
So I think, given we’re each so finely calibrated to moving our own exact mass around, that relatively small differences in equipment weight can actually be significant.
We are talking about sitting on a bike and pushing the pedals around, not jumping up and down. If 1kg makes a difference to you in overall speed over a few hours then so be it but I can't say I can notice the 20 seconds difference spread over those hours.
In fact some days I just feel faster than others and am sometimes surprised when I get home and upload my ride that I was actually slower than on some of the times where I felt slower.