Well I mean at that level what counts as a difference and what’s the measure of that distance. I like that this is an attempt to define it even if is isn’t op and we do t actually have any actual numbers, past or present for comparison.
With enough issues, no one will be at the average, by the curse of dimensionality. On the other hand, making it obvious that we're all nonconformists (à la https://www.abelard.org/e-f-russell.phpAnd Then There Were None?) might be an improvement.
So basically the same formula as variance in probability theory.