Important side note: they're both major home bodies so they wouldn't take advantage of living in a cool neighborhood.
To me it makes such massive sense to just bum it in their seperate upstairs 800sqft apartment and cheap food/rent/etc to bootstrap their lives instead of moving out. But it's a fight.
Luckily so far she's moved him from being very much in the NEET camp to actually looking for a job. But covid completely nerfed my ability to push him to have a job last summer (his pre-junior summer).