It's not the 5%. But inconsistency. If you only ever use one power meter, it doesn't matter what numbers it gives you, as long as it's consistent.
If it sometimes is 1% down and others 3% up, then that variation leads you to have no clue what your doing in training.
So in your training you have to ascertain that your effort over x amount of time can not be ~ 10 watts over or under lets say 200 Watts?
You do not want random variability. It's a scientific measurement and you need it to consistently give you consistent readings.
The key is consistent readings.
@fussballclub started
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It's not the 5%. But inconsistency.
If you only ever use one power meter, it doesn't matter what numbers it gives you, as long as it's consistent.
If it sometimes is 1% down and others 3% up, then that variation leads you to have no clue what your doing in training.