Do you miss the macOS shortcuts? I’m in the same boat as you (early 2013) and starting to looking more and more to X1 Carbon. The emacs-like system wide shortcuts is what I’m afraid of missing mostly.
Honestly, under Linux, I'm using i3wm[2] as a Window Manager and Emacs (with evil-mode) for mostly everything else. Everything is accessible with shortcuts. I don't miss macOS for those and not for a whole lot of other things. The only thing I haven't found a better (that's subjective, of course) alternative, yet, is HDR photography editing.
1. http://200ok.ch/posts/2018-04-27_Play_Emacs_like_an_Instrume...