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
Even given the very small amount of indoor rowing I've done on C2s I don't take much convincing that performance monitoring between different machines and models is indeed remarkably consistent. If this weren't the case it would make a bit of a mockery of competitions.
All that you've said reinforces the proposition that using watts as the measurement for relative performance between competitors in an event would be just as valid as using time or distance. One problem might be that it does not appear to be displayed to the same degree of precision as is the time in any but very short events. This may lead to slightly more "dead heats" being recorded.
To the poor chap who earlier confessed that he couldn't see how this would work ... simple!
The winner of a 2K event is the person who records the highest average power during the event. The winner of a 30min event is the person who records the highest average power during the event.