Not ignoring you Lusche, old bean, just the meaning of fighter to me is something that can actually put up a fight
That's more the definition of a "good fighter". Following your argumentation, we could again drop a few single engine fighters in AH from the "fighter" list...
The 410 can put up a fight in AH. It's just somewhat difficult. But it was being designed and used to combat enemy planes, and it is being used that way in AH. Chris3 has 469 kills to 280 deaths in it. Even I have 101 kills in it, and against enemy fighters I still have a 3-1 k/d
Addendum:
This is an excerpt from last tours fighter kill list. Second row is number of air to air kills, third row is air to ground. As you can see, the 410 did see quite a good portion of fighter usage...