out of the loop, how is terminal-based development related to FAANG?
Some even have their own editors.
There is a lot of value in picking a transferrable editor and using that. From that point it becomes "what is the best editor that will _always_ be available". Emacs/Vim fit that.
Then the muscle memory can begin to grow, and there is one less bit of friction in starting a new job.
One of the best pieces of advice I received was "pick an editor and go deep".
Agreed, I'd be infinitely less productive if I couldn't use the editor I learned to master in the past 20 years.
A corollary to that would be "pick a company that lets you use your own editor". There's lots of friction from IT departments towards emacs and vim. The package/plugin system is a security nightmare with lots of potential supply chain attacks and more importantly no trusted vendor to blame when something goes wrong.