I used to love making long equipment lists and spending a lot of time in character generation choosing gear, but I don't have time for that now. I want to minimize the chore of chargen before we can start the game and Schrödinger's Gear is one solution I've come up with.
The CR link to abilities is a compensation mechanic. The weaker characters get better gear (a headstart on the arms race) so they'll have more equal chance of surviving despite lower saves.