Remember, families didn't sign on for your start-up dream. Not being able to pay the bills is not cool. It's bad advice from people who've either never honestly been there, or folks who've forgotten what it was like there and are romanticizing it, or folks who are insecure about their success and want to build a struggle-against-adversity narrative to feed the myth of the hero-founder.
The advice is great for bootstrapped businesses who are looking to get profitable. It's probably not so great for "raising a round" venture backed "startups" who are playing the startup lottery.
If you're building a business, then being broke is a pretty great incentive to make things work.
Now I'm single again and will stay that way while I still financially struggle.