I use a Bitcoin backed debit card to buy bread. And where possible, I send people Bitcoin directly p2p for transactions.
When you have a hard currency that can't be printed + societal technological advancement that leads to the reduction in cost in the means of production, you would expect prices to drop forever (see iPhone price vs feature set).
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.
It's disingenuous to brush under the rug "get more for your money". That's sort of the entire point. With phone technology the lede is sort of buried and obscured, but in the bread analogy from earlier, getting way more bread for the same price (bread tech improvement or whatever) is significant.
