Why would you say that? Go back and read it again, all 32 team have backups that aren’t good enough to be starters, “with minor exceptions”, relevant to a given position group, it’s not hard to wrap one’s mind around. I did not say they were the “same”.
To help you along, one team may have better depth at RB, another team may have better depth at right tackle, No team has better depth across an entire roster as compared to another team, are you getting it now? Everyone realizes this as the fact it is, and it honestly doesn’t bear much discussion, if any at all. It is invariably a step down in performance when a backup has to play, with minor exception league wide, Capice?
Go Bills!!!