If you have a hard currency that can't be printed you'll have prices fluctuating with a fluctuating economy and that's really bad for any business. You really need stable prices. The central bank has some means (not great ones but better than Bitcoin) to put money into circulation or take it out of it.

As for technology, you'll get more for your money or it's less effort to earn the money in the first place, but you won't spend less. iPhones are a good example, you get more with every new model but the price doesn't go down.