Agree; power (work done) is a function of effort and time so spin speed (cadence) is not directly related
I was pretty sure that you recover faster from a low geared high cadence run of identical speed to a high geared grunt-fest… And obviously with less chance of injury. I guess that some building up of resistance slowly over time (introducing higher gearing while aiming for same cadence) is probably a good thing for endurance and outright power building.
Tbh, thinking about it now, I don’t really see it’s functionally different from weight training – you always go for lots of sets with slow build up of weight rather than trying to lift the whole gym unless you want injuries.
On the Lance thing (leaving the obvious alone) I understand he was so obsessed with higher cadences that he was defying conventional thinking on crank length and shortening those to up the spin even further..