and it did - for those technologies that became cheaper as a result. For other things that tech didn't increase the supply of, you end up paying more.

If you did not have inflation - or had deflation even, like in the case of bitcoin - everything would "become cheaper", but it would make certain types of goods/services scarcer (since they'd be paid less and less for doing the same labour due to the deflation, and so would choose to stop doing it at some point).

This totally ignores the greediness in capitalism, which cryptocurrencies exemplifies (there's no problems they actually solve, except the problem of how to make the rich richer)

Socialist countries and dictatorships also agree with you that inflation is good. It's not a greedy capitalist thing, it's a 'greedy people in charge of the money' thing. Inflation is theft, and the rich protect themselves by buying stuff that basically tracks inflation. The poor get run over.