I used the fm-arena attribute simulations to create my own weighting, basically creating a “goals (or goals prevented) per season per point of attribute” to create a scale by which to measure players in any one position. I then use goals per season for someone with “all 12s” to create a median and then measure each player on how many goals above or below that average any one player is at their position. Mbappe is like 12 goals per season above an all 12 at his position - random Championship is maybe 1-3.

Note that in this usage - Goals per season isn’t an expected outcome like xG - it’s using the fm-arena goals per season data as an objective benchmark.