Airplane said:
So if they can't even field a stealth fighter, why would they clone a Spirit in overall outer moldline? Stealth is in the details like GDT and build tolerances. Likely it will be a reduced observable aircraft with supersonic dash to compensate for a larger rcs. Right?
"Can't' isn't the same as "didn't".
The degree of stealth required in an air-to-air fighter is debatable, depending on weighting of various other factors. T-50 appears to be designed to the basic tenets of the *original* ATF before the stealth reset - low front quarter RCS, but not all-aspect stealth.
A flying wing /BWB is pretty much optimal for the subsonic long range mission and can be designed for very low RCS. Even if you have to spray RAM over the access panels before each flight because your manufacturing tolerances are not good enough.