And this is fine! This is the whole point of living in a civilization. Master your craft, get useful, trade with people who know other useful things, everyone is better off.

You could just as easily point out that subsistence farmers exist. That’s great, but we still need industrial agriculture to feed everyone. No single human fully understands that domain either… even ignoring the chemistry, biology and meteorology, those farms use digitally controlled tools! That means all of computer science is embedded in farming.

It’s great to pursue broad knowledge. It’s important to understand your dependencies and respect the abstractions you build on. It’s pure hubris to think an individual auteur can challenge a multi-billion person civilization.