If the trainer is the only source of power data used for reference, then for that user, wouldn't it always be 100% accurate?
I am really looking forward to the Neo's direct drive electrobrake, but regardless of the technology, if the trainers power data does not align with an external powermeter and there is no method (firmware or application setting) for scaling or calibrating the trainer power output to better match an external powermeter, then regardless of the price, the trainer is really not going to offer much value.

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¯\_(ツ)_/¯