I recall reading a book by Joseph Campbell, about the different ages in our past and why (he thought) they happened. The first of these ages is the stone age, of course. Our ancestors used stone tools for a long time, Neolithic cultures didn't appear until quite recently compared to the million or so years of using stone to make sharp objects. So even more recently we have the age of agriculture and animal husbandry. We started trading more goods. So we go through the Industrial Age, presumed to be drawing to a close. We've had cars for over a century, we now have a world wide computer network, GPS, medical scanners etc. Who would have predicted the arrival of cellphones would mean it would be cheaper than a landline eventually? The technology arrives but goes redundant more quickly. Computer engineers keep improving the hardware; most home computers are less than 10 years old. Could the age we're in now be called the Age of Redundant Technology? Campbell's reasoning about the why is more or less, "because we needed it". We needed to invent agriculture to support larger groups. We needed the steam engine for similar reasons, related to transporting goods around more efficiently.