In a 2v1, if you’re the 1, you’re essentially already dead. Either you’re chasing one while the either is getting free shots at you, or you’re simply being chased by one while the other is providing support. Realistically, you’re running for your life with one hand already on the ejection handles. If you’re the 2, there will never be a need for this since the bandit knows that even trying to down one of you is suicide.
In a 2v2+, this kind of maneuver is just going to generate free shots for someone within a few seconds. You’ll be a sitting duck, and anyone can pull off a missile shot on you without even leaving their turning circle, particularly with modern helmet cueing systems and high off-bore missiles (fighter pilots can nowadays literally just turn their head, look at something, and shoot at it with high success rates).
it almost never is. wwii ingrained the wing man concept into every air force and for a good reason, from the thatch wwave onward it allowed nation to rely on training, which can be as abundant as needed, instead of better airframes.
as such the whole pretend scenario is built on impossible foundations. you dodge one attack and the wingman scopes you up, while the attacker just accelerate away to safety.
"but what if the attacker is left alone" - then the attacker retreats. it'd be an exceedingly bad call to keep aggressing without a wingman.
A plane that does everything well, except be ready to fly when you need it, is not going to be a war winner in a serious conflict.
That said, it's a good exercise to expand your scope of "kills" from weapons, rocks, and gas to include things like maintenance and admin.
The idea isn't that you get shot in the exchange, it's that you force your enemy to abandon their advantage. The enemy has the choice to evade and lose their advantage, or go for the exchange in which case neither has the advantage.
This means that in cases where you have the upper hand you can use better tactics that don't incur high cost to yourself, whereas where you don't you can turn a 0-1 exchange into a potential 1-1 or 1-0 exchange. This is a pure win.