I never liked mixing Vim and Emacs. I used both, but for different things. I use NeoVim as my terminal editor, with tmux, zsh and iTerm2. And I use it for 70% of code I write. Emacs I have Installed, GUI version, and I use it for functional programming languages, mostly Lisp, Clojure, OCaml, Haskell feel better in Emacs. So there goes other 20% of code I write in my free time mostly playing with FP, those languages that lean on REPLs are clearly better integrated into Emacs and all that FP history that is pretty relevant in considering Emacs. And 10% is when I have to write something in Java where I have to fire up IntelliJ Idea, thankfully it doesn't happen so often.

Never got into that Emacs as an OS mentality, but I can see it's appeal to someone but I didn't like it. But I am really grateful for system wide shortcuts in OS X, just C-A, C-E has saved me so much time in macOS. And yeah, Emacs made me rebind ctrl to Caps Lock, which is so good, I can't imagine how I used keyboard before this!

I like UNIX and use it for everything I can. (there is other thing on internet called UNIX as an IDE)

Edit: and oh, I forgot there are some beautiful things with Emacs like magit. I have understood git and it's concepts thanks to this emacs git interface, now I am 10 times better and I know what I am doing in terminal.