Ignoring sub-models of existing "names" is a false argument. The P-47N is so radically different from the P-47Ds it replaces it's comparing apples to oranges.
The 109 G-14 is a major improvement over our G-6, but a major step below the 109K4. You can't say it's unnecessary or irrelevant.
The A6M3 has just been anounced. Would you say it was just another a6m2?
Or, to hit closer to home, would you say the B-339E (if added) is "just another Brewster"?
You can't just discount them because their are already "other" versions of that plane in-game. While some may be similar (P-38s, P-47N/M) many are totally different.
Going from memory on new fighter planes introduced since the B-24 when standards were upgraded:
F4U-1
F4U-1A
P-38J
P-39D
P-39Q
P-47N
P-47M
Mossie 6 (You could argue this! Totally different plane!)
Brewster
Bf109G-14
A6M3
Ki-84
I-16
So it's not as if they're IGNORING fighters, which one might read you have suggested.