to an extent, it's supply side economics - instead of adjusting the rent to the market, they're trying to create some kind of idealized tenant to adhere to the prices they pull out of their asses. then, they make stupid arguments about percentages of income - and, to the extent that they have a point, misunderstand that the problem is that they're charging too much in rent.
if you want to make these arguments, the proper deduction is that these units should come down 25-30% to meet my income, not that i can't afford to live in them - because i can.