Comment by Alex3917

Having worked at both greenfield startups and unicorns, I've found that virtually every problem I've encountered at the unicorn startups was caused by folks being incompetent at the greenfield level. Maybe when you get to the scale of Google things are different, but it's certainly possible to build a business big enough to retire off that doesn't require any more technical knowledge than what you'd learn at a two-person pre-PMF startup.