Except that games back then were limited in code size by what could be stored in memory on the target systems. All the game code that I have seen from the 80s a

Except that games back then were limited in code size by what could be stored in memory on the target systems. All the game code that I have seen from the 80s and early 90s came in well under 100kloc and library dependencies weren't a thing because of the same resource constraints. This changed over time and now almost any contemporary and technically decent game sits on top of several hundreds of thousands or millions of lines of 3rd party code.