I used to work within the Chromium codebase (at the order of 10s of million LOC) and the parts I worked in were generally in line with Google's style guide, i.e. consistent and of decent quality. The challenge was to identify legacy patterns that shouldn't be imitated or cargo-culted for the sake of consistency.
In practice that meant having an up to date knowledge of coding standards in order to not perpetuate anti-patterns in the name of consistency.
tinybox red and green are for people looking for a quiet home/office machine. tinybox pro is for people looking for a loud compact rack machine.” [0]
[0] https://pages.cs.wisc.edu/~remzi/Naur.pdf [1] https://www.youtube.com/watch?v=2MYzvQ1v8Ww