Err, the point is one mode is MORE immersive and one is MORE accessible one.
By your logic, "realistic" is also a bad name because they're both supposed to be realistic.
The immersive mode has less hud, no radar, so is therefore more immersive.
The accessible mode, has hud and radar so players of regular FPSs aren't lost, ergo its more accessible.
"Veteran" and "recruit" dont describe anything. If anyone guesses it will be that "veteran" is hard, and "recruit" is easy, which is not meant to the point in the different modes.
It is cool, difference of opinion is healthy.
All the modes are suppose to be realistic, immersive, and accessible, that is what HOS is striving for as a game, in my view any ways and based on what the devs have described. That is why I have a beef with your naming format.
Your accessible mode should equally be an immersive experience for new time HOS players, even if there is a HUD and helpful battlefield guides. Accessible mode should then be, based on your description, "Accustomed FPS Mode." Devs dont' want to include "realism" in any of their difficulty modes because they feel people will be drawn away. Regardless, the two game modes will clandestinely be, even with different names, Realism and Relaxed Realism (and Custom as third).
Frankly I really don't care what they pick because players will ultimately decide and figure out what mode they like whatever they are called. And I think most of us are over thinking this (including me). Keeping it simple would be best.
So, maybe we need to find a substitute for the word realism, because that is clearly the word the devs want to alter--maybe "Classic":
Classic (RO)
Relaxed Classic
Custom