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You're joking right? I've got hours and and hours and hours of power data from years of training with power meters and as Ed says, at best your power meter is 2% accurate so your 2% left right swing makes no difference because that will be constant in you. As long as you're happy that you're only using power for training and not willy waving then it is constant in yourself.
But stages isn't consistent. LR balance changes with effort and fatigue as well as cadence let alone injury etc.
The only time it would be worth while was if you only had a left leg.
As mentioned, the Team Sky argument is meaningless, they are being paid to ride them.