I think that ROK has adopted an intelligent approach to developing KF-X. Design an airframe that can be converted to an IWB airframe without re-starting design from scratch, resulting in an aircraft that is very competitive cost-wise with sophisticated 4G fighters, then modify the design to give ROK air force a 5G fighter and address the 5G export market.
ROK could be selling a 4G Rafale/F-16 competitor for quite a few years and also a 5G competitor to F-35 (and KAAN and AMCA when they appear) for many more years.
