Comment by Silagi

That seems like the least charitable reading of what I wrote.

"system they're working on" refers to the actual physical hardware.

Yes, I look at the code regularly, and a significant portion is hand written, especially the performance critical sections.

A security issue I haven't been able to track came up in automated code reviews. Maybe you're such a savant that you can crack any security issue in a codebase you're working on, but the last few months of critical security bugs in infrastructure with the most experienced and capable maintainers in the world should at least humble you a little.