Head-ons where both planes blazed away were a fairly routine aspect of air combat throughout WWII, in many different AC, and for many different countries. And I've read quite a few pilot accounts.
In fact, a couple days ago, I was reading Hammel's Guadalcanal book, not even looking for accounts of HOs, and found two instances of Hellcats HOing Zeros. They tend to be treated as something unremarkable.
There are aircraft matchups where it is generally to your advantage to HO. I fly 51s mostly and don't try to HO, but I will go out of my way to HO Yak-3s and such, because my conv. is set long, and I know Yak-3 guys set their convergence real short....I get a few pings in and break quickly....often they're crippled, have an engine smoke, etc.
As part of air combat, planes will end up heading right for each other A LOT.
Do people deliberately TRY to HO more in AH than they did in real life? Sure. But that can't be rectified until HTC comes by and kills you for real if you die in AH.
But the mindless buffoons who whine on Ch. 1 the instant anyone in their front hemisphere opens fire on them, or proudly announce that they "don't fire" in HOs are full of it.
The AVG was ORDERED by Chennault to HO as much as possible.
But, there actually were no Zeroes at all in China during the time of operation of the AVG as the AVG. There were a few Zeros in China previous to the US entering the war, and then some well after the era of the AVG had ended.
So they never even SAW a Zero (which was, of course, Navy-only; China was mostly a Japanese Army war.) Got in an argument about this on a different board (non-flight sim or even military) it's amazing how people are incredulous of this. But, of course, there's alarge population of people out there uunaware that Japan had any fighters other than Zeros.
The vast majority of AVG fighter kills were oof fixed-gear Ki-27s generally inferior in every aspect of performance to the P-40 other than maneuverability.
Problem is, it's a better "Story" if the AVG was killing Zeros.
It's also amazing how many people still think the AVG was in combat before Pearl Harbor :-)