[quick_brown_fox]

I mostly agree, however experienced a different challenge exactly for the very reason of consistency:

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.