You can't confirm kills and hits from ww2 gun camera footage. That's ridiculous. You can see that their firing AT stuff, but getting actual kills from the cockpit was very difficult, and there's no way in hell you could confirm it from ww2 plane cameras
Long story short loiters should go, strafes should replace them. Mostly because of gameplay reasons
So, you're trying to say here that whole sub category of WW2 planes that exists up to this day, ground attack planes, were so inefficient that they just kept building and using them?
Seriously, go read up a bit on combat use of IL-2.
Loitering strafes was EXACTLY how it was used, just instead of circling and waiting to be shot down, squadron attacked with every single loop.
It was extremely effective(for soviet standards) against vehicle columns and IL-2 being literally a slow flying tank allowed for that effectiveness while keeping very low pilot casualties.
In one instance during single battle one pilot lost 5 planes and just kept coming back for more.