Because all La-7s do is HO, run away for a sector, turn back, HO, run away for a sector, turn back, HO, run away for a sector....
Or my personal favorite: attempt to HO, lose angles, start to run away, turn around when your opponent breaks off to not get suckered in hoping for a cheap shot at the back or another HO if they're onto that trick, lather rinse repeat.
Plus there were all of 200 of the three-cannon birds built, yet while as rare as the PERKED C-hog IRL, the three-cannon La isn't.
The complaint isn't that they're uber, it's that the dweebs flying them never learn how to do more than HO, lawn-dart and ram.