So this is a different discussion than the one your previous comment argues against.
"Simplicity is the ultimate sophistication" is a nice-sounding catchphrase but in many contexts does not hold water. For example, systems without redundancy are objectively simpler but not more reliable.
But more fundamentally, currency and money IS a technology. It's use is as you say to distribute power and express trust. But fundamentally it is a technology used for that purpose.
Cryptocurrency is ultimately about putting power in the hands of the people and trust in mathematics rather than central authorities.
Eventually the central banks and banking institutions as they exist now will be phased out and replaced with different paradigms that have some similar functions but more sophisticated technology.