I'm old enough when hand held calculators had yet to be invented and we were forced to memorize the multiplication tables and to learn how to do math by hand.
By the time I got into the working world, hand held calculators were in use (though personal computers were still several years off) and I still had difficulty keeping up with the real smart guys in our finance job who could rattle off all kinds of things at the blink of an eye (such as instantaneously knowing that an 8% commission on a $1.4M transaction was around $110,000 or so. They were much faster doing this stuff in their heads than they could have done by punching in numbers in a calculator or a computer.
Uber smart people that can do these things are still in the business world. I was sort of able to keep up with them because of my math training. For sure, the folks relying strictly on machines to do those calculations will always be way behind those uber smart folks who will be making the big bucks. The folks that leave the thinking behind will need to learn to struggle with low wages.