That's all very true. But the reason it happens is because we can advance technology but not (yet) our brains.

In the future, I think, technology and brains will mesh (become one). So your calculator will be in your brain. So you will be able to do all the calculations. I mean, you would like to know how to grow cattle and navigate with the stars etc., right? I know I will!

But even now, as long as people push themselves to the limit, at least some function of ours will be trained to the hilt. Socrates may have had a great memory, but there's also things he didn't know. Like maybe he also didn't know how to grow cattle and stuff, cos it was the farming society that allowed him to stay in place and philosophize while the slaves did everything else. How else was he able to spend most of his time at the Agora?

So they also made inventions that allowed them to do what they really wanted (philosophize and talk about politics). We drive cars so we don't need to walk, and in the future driverless cars will allow us to move without needing to drive! We'll read instead of driving, much like many people now listen to audiobooks while driving. We delegate so we can do more, not so we can do less.