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I definitely agree that having a child can be a spectacular forcing function for focus for some. I unfortunately also know folks for whom having a child was the proverbial straw, and whose life fell apart afterwards.
I was running my own company (RFID and industrial automation startup) before him. When I became a dad I found a corporate job. The worry around healthcare costs for a family as an independent were simply too much for me, even back then. All in all, I feel very fortunate in how it all worked out for my family.