[yongjik]

I have no idea how great a developer Howell is, but it's simply not true that Homebrew was used by many Google employees. I was at Google at that time (2015), had a macbook for several years, and had never even heard of Homebrew.

Google is a linux shop, and you were generally not allowed to even keep the source code in your notebook.

[top_kekeroni_m8]

Where would one keep the source code then - if not locally?

[yongjik]

Either in a desktop sitting securely under your desk at office, or "in the cloud". You would remotely connect to them to do your development. (Most of Google binaries I saw were way too heavy to run on a Macbook, anyway.) Macbooks were just for checking email, calendar, or similar stuff.