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I think you'd need pedal power meters to really know.

No, they are equally useless on regular bikes' chains. I've owned several chain measuring tools and they all gave me nonsense measurements. Brand new chains were measuring as worn, etc. Someone back then, probably on Usenet, explained that it was due to incorrect measuring technique (something...

Measure using a ruler or 3-point tool. Anything else will register much more wear than there actually is.