To follow up on my post from yesterday, it seems most Emacs folks on macOS use emacs-plus from Homebrew. It seems emacs-plus also has the most recent Darwin version.
Meanwhile, my new Emacs install crashed on me once (again, I am using emacsformacosx). I think I will switch to emacs-plus when I get the chance, just to be sure, but the crashes will probably keep happening.