The 1950's wasn't the right era to try to force a "Multi-Role" fighter.I'm interested in your idea of what the requirements were, and what mid-1950s aircraft could have met them.
But they did, and via brute force.
But now that we're in the age of Multi-Role fighters, you're not going back for numerous logistics & economic reasons along with the nature of air warfare changing thanks to "Stealth" being the dominant requirement.
The F-20 TigerShark is what the F-5 should've been, but too little, too late.The F-5 was never a good all-weather option, and would not stand up to one carrier trap. The F/A-18 had 20 years of advancements over the F-4, but they had to make a second try with the Super Hornet to get it a more respectable combat radius.
I guess elegance is in the eye of the beholder. For design and engineering, the Phantom wings were a very sophisticated achievement, incredibly strong with only about a 5% ratio. The tail stabilizers, of course, are a fascinating and distinctive solution.
The Phantom did everything it was created to do well, and was so much better than its contemporaries that it was eagerly snapped up for new roles. If that's not an elegant design, I'm sure any aeronautical engineer would be happy to take credit for whatever it is.
The Super Honet as Congresses attempt to get a Multi-Role fighter by updating the F-18 platform.
For me, The F-35 family is elegance because they had to design it to meet so many damn requirements that congress set out for them to do, and they managed to do it.