Technology is an ever-changing thing.
It is constantly evolving and switching trends, sometimes as quick as one to three months. It is hard to believe that Pong was once the height of technology, some twenty years ago. Or, that today's personal computers are more powerful than some U.S. space shuttles from the early eighties. Collectively, computer users hae become a society of upgraders and updaters, always advancing their systems. The computer you buy today will be outdated in a week or two.