The general argument form of:
<there are lots of default keybindings -> learning default keybindings>
The argument form also ignores the idea that key-bindings can be aligned programmatically. Emacs is designed for programmers, after all.
In my opinion if a tutorial emphasizing CUA makes adoption rates higher, then the tutorial is more successful. The idea that CUA is not good Emacs is a social more, not an Emacs idiom. The emphasis on standardized keystrokes as the starting point in Emacs tutorials, logically parallels the idea that the first step to learning Emacs is to remap the keyboard to Dvorak for efficiency.
Someone wants to learn Emacs. They start with the standard Emacs key-mappings. Now they have two things to learn...
The second is the language of Emacs. The first is the gang-signs of the Emacs community.
The Emacs model has a command language and a means for making command language abstractions, elisp. The ability to make keybindings is feature of the process for making abstractions in the command language, individual keybindings themselves are values.
That's very insightful. Thanks!