&gt;LoC is no measure of complexity of a system<p>Agreed but I&#x27;ve often been curious about the complexity myself. I saved a similar discussion on reddit a few years ago. One commenter worked for a company that makes Stability Control Systems for major car manufacturers and this comment really stood out for me:<p><i>Like, for instance, BMW wants us to follow this architecture standard that (very simply) requires all function calls between sets of &quot;subsystems&quot; to route through one file. It is currently at around 120,000 lines. That&#x27;s one file out of the thousands of files we have. We have many &quot;database&quot; files that are thousands to tens of thousands of lines long as well.</i>