Has nothing to do with what they wish to learn as much as what you are willing to teach them in your opinion. Or you wouldn't be fighting this. It doesn't matter to you that every Allied fighter pilot learned this to win ww2 in the air. And no newbie has to do anything more than find out on VOX or country text how to turn it on. Then offline all alone let it actively show them lead against drones. Not one boring wasted moment having to read anything like a manual, learn rads, Mils or go to gunnery school like the real pilots who had to pretty much memorize the math and regurgitate it on demand for their instructors.
It is a tool to show them lead in a standardized format with the measurement values standardized by the AAF, NAVY, Marines and British Commonwealth. Every fighter pilot talked the same nomenclature and understood exactly the same terms when describing range and lead. In our case today, instead of relying on every player newbies talk to for just as many variations in understanding or lack of, for ww2 gunsights, reticles, and what they ever exited for.
If every new player engaged a Trainer we wouldn't need even the LCG or this conversation. I will venture far more teach themselves for a few minutes offline and suffer the MA than ever go to the TA. This is a tool to help keep them around longer. Or are help aids only what the AH Trainers say they will be and none trainers are well, less than appropriate to even consider they know anything beyond rutting around blindly in the MA?
As for "Bag the Hun'. It's simpler to understand then Schiessfibel. The British found their pilots didn't do well simply reading, memorizing tables, then trying to execute that in the heat of battle. Fighter pilots are visually oriented people in general, and the choice of making BtH in comic book style. I have even an english translation version of Schiessfibel. Klunky, and Oh so engineeringly full of formula and memory tables with illustrations that need a "Trainer" to tie together for the fledgling pilots. Very German. Even the Germans taught the same tables of lead by rings, divisions of the 100Mil ring and in their view 5, 10, 20, 30, 50 degrees to the line of travel. Those extra tick marks past the edge of the 100Mil Revi ring out to "50 degrees".
The principle's from "Bag the Hun" were precisely why nearly every AAF fighter plane in the ETO not shiped with a Mk8 until the K14, was refitted with Barr&Stroud MkII which is simply a Mk8 with only a 101Mil ring and dot, so the AAF pilots could calculate lead against 109 and 190. Even with the advent of the K14, pilots kept their MkII with some even taking them to the Pacific when they were redeployed.
I guess from your point of view what they learned from a war doesn't matter in a game whose hardware and physics is modeled to work like theirs did. Or is Hitech just making all of this physics up and all of the tech data and teaching curriculum from then is bunk to this game versus your self?