Ensō: design constraints of a focussed writing tool

you can always install Emäcs and put this at your init.el file;

(menu-bar-mode -1)

(scroll-bar-mode -1)

(tool-bar-mode -1)

pronto, a solid decades old platform that is privacy oriented (whatever that means on text editors); runs flawlessly on Android too, has an easy sync with Syncthing (just add (global-auto-revert-mode) for real-time synchronization) to your computer/server; ALL shortcuts are customizable so you can set Copy/Paste/Cut to whatever is most ergonomic and crazy stuff like accessing your ibuffer with i-search mode for an easy navigation at your files that's keyboard-centric but you can use your mouse with its buttons doing whatever you want/set, just fine; org-mode...

it can even run on a, distraction free, terminal ^-^

I would use emacs in a blink of an eye. It is such an incredible and powerful software. Unfortunately it lacks a decent editor.