I agree. And slowly credit scores are starting to take rent into account.
> There's no difference at all for someone who works a dayjob.
But there is a difference. If you put your living expenses on a $500/mo credit card, you can have a $120k job and be eating ramen, living in a flophouse and spending the rest on drugfs or supporting people who cannot work. You cannot afford to service a mortgage. If you commonly service larger debts, then they don't have to worry about hidden things sapping all your funds.