Not all organizations have such robust communication structures, low levels of dysfunction, or git hygiene. Also, as mentioned, in a corporate environment where

Not all organizations have such robust communication structures, low levels of dysfunction, or git hygiene. Also, as mentioned, in a corporate environment where the software is proprietary and certain source files may sit dormant long enough for the original authors to move on from the company, it's important that they don't take the "how/why" part with them, so to speak, and leave the next maintainer SOL.