Yeah, we have way too many Mustangs and only 4 members
of the FW family
What'd you expect? The 190 entered service 2 years before the Mustangs and stayed until the war's end.
The Mustang came very late in '43, and still contended with the P-38 or the P-47 until the USAAF finally switched most of its assets to the P-51s in '44.
The only 'pony' that served in the war, in overall generalization, is essentially the B and the D, which we have both.
If any USAAF fighters need a new variant, it would be the P-47C.