Not exactly the question you asked, but you may want to read the chapter on “Large-Scale Changes” in the “Software Engineering at Google” book: https://abseil.io/resources/swe-book/html/ch22.html

You may wish to search for "readability at Google". Here is one article:

https://www.moderndescartes.com/essays/readability/

(I have not read this article closely, but it is about the right concept, so I provide it as a starting point since "readability" writ large can be an ambiguous term.)