Sounds like the curse of Emacs.
I'm trash at vim (I use evil-mode), org mode, and org-agenda, but I'm still lightyears ahead of where I was 2 years ago before I used these tools.
Did you topped out the tool or your personal ability?
> but I'm still lightyears ahead of where I was 2 years ago before I used these tools.
But is this because of the tools, the gain of new experiences or the 2 years difference?
And how do you know whether you are really moved forward, and not just run in circles appearing busy without being more productive? Do you have some objective metric for this?
Both, I'd say.
> Do you have some objective metric for this?
Well my happiness, for one. My sense of accomplishment. How much more I can fit in a day. But no, I don't KPI myself.
Emacs has a number of collaborative editing solutions: https://www.emacswiki.org/emacs/CollaborativeEditing
The nice thing about org-mode is that it automatically gets all the cool stuff that emacs has. (Although, I have never tried any of the solutions listed in that wiki page and I suspect even the "working" ones have issues).