Yep. I'm currently solving problems experienced by senior/lead engineers on large enterprise systems. I know about the problem because I've been that engineer, and know a whole bunch of my peers have the same problems. If you haven't been a lead engineer on a big system, it's not part of your experience - it's not something some fresh grad would work on, period.

Even better startups come from deep business knowledge. Not necessarily unicorns, but great lifestyle and niche businesses that make the founders rich. And really, do you need to buy two Lear jets?