Then Britain should get this ‘vehicle’ instead, either as it’s own aircraft or as an armament variation of the TT aircraft. As for this ‘replacing’ the A6M2, no. We managed to lose one more copy-paste vehicle, no need to replace it with another. While it is better in that it was actually used, that isn’t enough for me to agree that it is worth implementing.
Which is not a meaningful issue, not meaningful enough to justify another American Spitfire. And let me humor you for a second, and say that there is a gap that needs to be filled. A vehicle that would fill such a gap should not be premium, it would have to be in the tech tree, which would preclude your proposal.
Besides, if you really want a ‘dedicated American dog fighter’, the P-36 is right there. And if you are really deadset on more ‘dedicated dogfighters’ for low tier US, there’s a plethora of P-36 variants out there that could fit, and probably quite a few other prototype aircraft as well, though I don’t know enough about aircraft to know just by looking at a stat block about just how maneuverable a plane would be.
And if that, for some reason, isn’t enough for you, go play some of the minor nations that could do with the players. Not every nation needs to have everything, and the US does just fine without a ‘dedicated dogfighter’ at 3.7. At that same BR, you have not one, but two P-51s, and .3 higher you get to the P-51D, the Airocobra, and the Black Widow, all of which are incredible aircraft. There is no need for more copy paste bloat then is necessary, and an American Spitfire isn’t necessary.