That's true. Everything that's a "bad idea" in general has worked out for quite a few people, somewhere at some time.
I always vehemently caution against couples moving in together until they've dated for a while. But I say that tongue-in-cheek, since my husband basically came to spend the night one time, and just never left. We barely went "on a date" before we were pretty much living together. So for everything that is, in general, a terrible idea, there is someone who has done it not only successfully, but with virtually no problems.
Still doesn't mean I'm going to recommend people start living together before dating. By and large, it doesn't work.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker