On one of my machines I'm just using default emacs. Maybe going from all the customizations back to vanilla emacs was part of me "learning emacs" but I think I'd tell my past self that I don't actually have to read up as much as I did and that emacs and vim aren't as scary as many people tried to make me believe.
In the end learning to do the same old things as with other editors doesn't really take more than going through the tutorial, most people will already work as fast or faster by then, before I took the dive into vim and emacs I was very a "mouse and arrow keys" guy when it came to text navigation and editing.
There are of course many things that could be improved when it comes to emacs defaults, I wish the devs were more open to update some of the low hanging fruits.
It's the exact opposite of sinking costs, and rather focus on "good enough" because you often end up switching or changing stuff soon enough anyways.
So more like how fast can you just go from default install and choose the sanest defaults and not spend time on tweaks / unix pr0n. Install what you need just in time etc.
It makes even more sense when using defaults on several remote systems, kind of like just using vi.
I may switch over to a new school UI based editor one of these days. I used VSCode for a bit but got sick of it.
Like OP, I really wouldn't recommend emacs to anyone just learning.