That is what I never understood -- I've implemented exactly this "which editor emulation do you want to use" and "edit your own bindings" for one Windows product containing editor in early nineties. It wasn't hard. The default was, of course, the "least surprising" for the platform, but it also allowed other popular editors then. If there's anything that can reduce friction to the new user, it's that: a beginner can use the actions he already knows how to do. Let him just the ability to access those that are unique -- for these he anyway doesn't have any reflexes.
My biggest eyeroll whenever I looked at Emacs "help" (or any other, Emacs is not unique in that approach) was "and then you use Meta key." Well I don't think that anybody bought a physical keyboard with a key on which it was written "Meta" for a least 30 years. How about recognizing that for the beginners?
https://en.wikipedia.org/wiki/Meta_key
"But, meta is not always the same key" I hear every time -- fine, but that should also be the part of "advanced stuff." Just let people know that they initially have Alt, Ctrl and Escape where on the keycaps Alt, Ctrl and Escape are written.