@luxyr42 @mike It gives a ceiling, not a floor or average power level.
Treating such system as not informing deck building is ignoring human behaviour. People will avoid including a single card from a higher tier than they enjoy playing. Unless it is worth bringing up in Rule 0 conversations and explaining that it isn’t a good way to think about this deck in particular.
And players will treat a single card from +1 tier more kindly than they will treat a tier 1 deck including a tier 4 card.
I am also wondering who is going to actually handle ranking the tens of thousands of existing cards(gatherer says 28712 legal in commander at this moment), plus hundreds more from each set as they release. Might need to be crowdsourced to be done in a reasonable time. Every deckbuilding website is also going to want to implement that info in their database.
