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Use inappropriate gears - you'll develop a better cadence range and probably be stronger for it.
Agreed. I've re-learnt how to push bigger gears with lower cadences on a bike with a 6spd block. Surprised me how much I must chase through an 11spd cassette trying to stay on 100rpm.
Found on my local evening '10' course i'm better pushing a bigger gear at lower cadence on the draggy bits rather than spinning on a smaller gear. Must be getting old...
I think racing (read sportive riding) requires the closer ratios you get With a 2x11. As you cant dictate paceline speed. But you absolutely want optimal cadence.
For everything else 1x is the way to go.