To be clear, the Vought 1600 (a partnership with GD where Vought took on the prime role and GD became a sub, similar to the what happened with Northrop and McDonnell-Douglas with the YF-17 and F-18) never left the conceptual design phase. You won't find a Vought 1600 airframe in any museum.
> Not just because of the LWF program, but because that was its designers’ ethos inside General Dynamics.
And also on the part of the USAF instigators of the LWF program (the so-called "fighter mafia"). The interesting thing is that if you look at the combat & military exercise record of the F-15C, it contradicts a lot of what the fighter mafia took and preached as gospel, at least as far as the air-to-air theater goes. The F-16 did/does enjoy a great deal of success as a multirole fighter with a non-trivial emphasis on the ground attack role.