Back in the day nearly all planes were taildraggers and one did many things by feel and intuition, America was a more rural socieity and boys tended to grow up with an ear and feel for machinery. Even my generation of "boomers" pretty much still fit that bill. Flying when I started out was mostly seat of the pants, a lot of it anyway. A friend and I learned to fly taildraggers by buying a Supercub in Idaho and flying it back to Alaska, with a compass that only pointed East... These warbirds were flown by war trained, mostly ab initio pilots, with often little time. Of course they crashed a lot of them as well. The person we had in Fairbanks who had flown the most types was a woman ferry pilot! She said the Mustang was a real pussycat. Another guy we had in Fairbanks flew the only ski equipped Mustang, once, it' only flight. The biggest issue was the torque required you to start the takeoff run at a 90 deg angle to where you wanted to go....
Performance, indeed! Jets are pretty easy to fly for the most part, the engine management being more forgiving (some early example being an exception) but thinking maybe a hundered miles or more ahead is a challenge for many. Experience makes that easier. Employing an aircraft in a tactical manner, effectively, makes flying competence a given.
Maybe almost anyone could get away with a lot on a good day, not all days are good.... Where I learned to fly in the early 70's guy in the FSS had a Mustang and sold it because he couldn't aford to put 50 cent gas in it.... The FBO guy had a SNJ.. Neither spoke of them as hard to fly, just a lot of fun!
A lot of war trained pilots never flew after the war, I suppose if most of your aviation experience had to do with getting shot at it might dampen your enthuiasm.
Thanks! T