Indeed the 6 o'clock was the preferred position for the reason mentioned there. Notable exception was against allied WW2 bomber formations where the German fighter pilots were forced to continuously re-evaluate their tactics and much heated disagreement was had over how to tackle the formations. Forward fireing fighters was one thing but 150-300 rear turrets, ball turrets and top turrets, 300-600 waist gunners, that was something different and something that scared even the most hardened veteran witless.If a fighter pilot returned to base without the need to change his underwear, then he had avoided the fight.
Fortunately for the allied, the Germans never jumped on the self-relying, heavily defended bomber formation bandwagon, instead they relied on tieing up their own fighters in escort missions to escort sub par Ju-87s and hopelessly outmatched 111's (against modern fighters that was), with strict orders to the pilots not to break off to engage enemies at a distance, before giving counter orders, before counter the counter orders then.... *sigh* they made a mess of it and the allied rejoyced. Göring in particular was the best thing that happened to the alllied in that respect. One has to wonder if he was secretly on their payroll
Anyway, to take on a German bomber formation was less harrowing due to their lack of protection, relatively speaking (even a Stuka had a rearwards pea shooter but the He-111's bathtub meant the gunner had to get up, turn around, lay down again, find aim only to find the target gone by then and that was only after they installed more than a single down/rearward pea shooter). To take on a 3 ship flight of 111's, even in a Skua, meant you had the odds on your side and it was pretty much a rock around the clock fight. A 109 against 3 B-17s not so much.