Originally Posted by JKinTX
Exactly. At the time, airframe development was outpacing engine. Other examples are the Douglas A2D Skyshark and the Convair Tradewind flying boat as well as the F3H Demon.
The problem with the Cutlass was mostly the engines; by the time better would be online, the supersonic F8U Crusader was already on the horizon and it was thus already obsolescent.
I've remembered another one, I believe. One of the Thunderjet-derived designs, probably the Thunderstreak, was terribly underpowered when loaded for a mission, and used up as much runway as a loaded B-50 did, so it couldn't be based at a normal "Fighter" strip, which was far too short.