Another thing I'm not seeing talked about here, is how advanced and superior, not to mention how much faster shifting, today's modern 8 and 10 speed automatic transmissions are. When compared to how the old 3 speed automatics were, "back in the day".
When you go back to the 60's muscle car era, most every high performance car tested back then, ran a faster 1/4 mile with a 4 speed stick than it did with a 3 speed automatic. (Assuming you had a person who knew how to drive it).
Today that's not the case, because the automatics have more gears than the stick transmissions do. (Usually 6 compared to 8 or 10 the auto's have).
The ZF 8 speed for example, is a mechanical work of art. It can also take the high horsepower these modern engines can dish out. The older Torque Flight's and Hydramatics would often fail in the older muscle cars if they were pushed, because they couldn't take the power as well without breaking.
There was / is simply no comparison of yesterdays 3 speed automatics, to todays 8 and 10 speed versions. No one in the 60's produced a factory automatic transmission that could not only handle the 700+ horsepower of a Dodge Demon, but also deliver that power to the road so efficiently, as today's 8 speed ZF can.
Simply put, there is no longer any performance advantage to having a manual. If you still feel the "need" to manually shift for the fun of it, most all of these modern 8 and 10 speed automatics offered today have a shifter paddle mode to drive in.