By 1964, when I bought my first one, Casio and Texas Instruments sold a handheld that had shrunk the calculator to the size of the power supply on my Mac Pro. The cost was $70 which is $560 in today’s purchasing power.
Today, an extremely more powerful calculator is included with our smartphones for free and no added weight.
I no longer need to carry my slide-rule. By my calculation, that is progress!