That’s because the current Mustang might as well BE a 65 Mustang, because the styling is the same and it still has the same primitive stick axle under the back, etc., etc.
And you’ve missed an awful lot about automotive technology. Major advances include variable valve timing, stratified charge heads, Miller-cycle engines, turbocharging as a mass market technology, supercharging as a mass market technology, overdrive transmissions, locking torque converters, drive-by-wire, throttle-less engines, camless engines, flex-fuel engines...the list goes on and on.
The fact remains that today you can get two to four more times the horsepower per unit of displacement than people even dreamed of back in the 60s and 70s. You can get a 2L fourbanger and get over 650 horsepower out of it - and still have it be docile enough to drive to work or the store every day.
What you call revolutionary, I call evolutionary.
Everything you mentioned is an improvement on a system, but nothing that radically changes the basic concept/mechanics of an automobile.
Some of the micro-electric cars you see comming out are radical departures from what an automobile was in the past. But what Detroit is putting out?