ergoemacs-mode VS crux

It's a tiny tweak that gives something like 1% of the functionality.

The real, useful, working CUA mode for Emacs is here:

https://ergoemacs.github.io/

If you start with framework you might not learn enough to solve problems later, but using it later to simplify your config should be ok. For example ergoemacs http://ergoemacs.github.io/ is a nice way to make Emacs more ergonomic and easier to use(if having problems with default configuration).

For example I use https://github.com/ergoemacs/ergoemacs-mode, with some commands that I have acquired as muscle memory from using Emacs/mg for long. And still I use nano when I need to do small edits to a file. I also do it almost without thinking about it, especially when doing "sudo nano whatever". Mg should be better for me, but nano is engraved into my palms for some reason.

That documentation seems very outdated. The changelog is from 2013 and that function was removed (according to an issue) before 2015.

Xah Lee and friends maintains a mode called ErgoEmacs that implements most of the changes he proposed: https://github.com/ergoemacs/ergoemacs-mode

For those still on 28, crux-rename-file-and-buffer does the same thing (https://github.com/bbatsov/crux). I've been using it for half a decade at this point. This sort of command, that no other code will rely on, was never that important to get into core, and there's some merit in making people create the commands they needed. It's not like with the additions to subr and subr-x libraries (string-replace, string-search etc), which can't come fast enough.

Use vc-rename-file or crux-rename-file-and-buffer from crux

A similar functionality is in the crux package (see crux-delete-file-and-buffer).

How about https://github.com/bbatsov/crux?

Some packages I use for more effective text editing is crux for general text editing (video on crux), paredit for lisp editing and for org-mode:

I'll go with crux. It's not all about text editing, but it's got a lot of commands in dwim-fashion.

I learned the syntax of org-mode in an hour (maybe less), It has many superiorities to markdown (see this excellent essay). Emacs is a fully-featured tool, it's a lifetime of learning, just like all extremely powerful tools, you can see the blogs of many emacs experts like Bozhidar, Protesilaos, Karl Voit (to name a few) learning new features of Emacs quite regularly.