There's another related lesson there that progress, like evolution, is progress in a certain direction. No one said that direction is whatever you call "good" at the moment.
... and some evidence supports they were smarter...
http://www.huffingtonpost.com/2013/05/22/people-getting-dumb...
Obviously there is some interplay with the fact that we develop new mental models and thinking tools to augment intelligence.
Also immersion as children in highly abstract ways of thinking further augments/multiplies raw intelligence (most convincing explanation to the Flynn effect imo).
I've lost the link, but there was an excellent article I read related to the amazing Otzi discovery (https://en.wikipedia.org/wiki/%C3%96tzi) describing how adults of that era (modern humans, primitive societies) would likely have been terrifying to us now in just how much they outclassed us in raw strength, intelligence and stamina. We would be relying a lot on the benefits of childhood nutrition and education to feel superior. This isn't completely convincing, there are a lot of factors in play, but those levels of brutal competition and danger would have a profound effect, especially epigenetically.
Especially as a sysadmin, I spend so much time in a ssh cli, that part of my reasoning was "I want to be able to do all my normal tasks without the gui." Gmail, news, and rss in gnus, irc in erc, org-mode (loving export to latex for reports), eww for browsing, and who knows whats next. Elixir and go modes are improving too, and my general productivity due to staying mostly inside a single ecosystem has really improved.
Another reason I have done this though, is I feel like it's less about gui vs text, and much more about FOSS vs proprietary. In a few years when everyone has an iBrain with Apple (NSA) inside, I intend to have a MEmacs brain that I have control over.
I think RMS will be vindicated in history as a man far ahead of his time.
My mind was constantly being blown in that class.
And the great error handling when it doesn't know what you just told it to do. ?