Because, most of the time people say that just in the context of the blockchain. In that sense I can also say that you can control vast majority of money by just having knife and glove skins in Steam (for the game Counter Strike). You also can trade/send/receive. But the moment you decide that you want to convert to "food" all sorts of problems arise that are worse than what banks offer.
I'm telling you as a person who received salary in crypto while living under sanctioned country
I'll give you some bread and milk for 100 BTC if you want. I'll even fly to your country to personally deliver them to your house.
If a corrupt third world government is scared of a piece of tech, it is, imo, good tech
Purchase and sale of bitcoin is highly regulated and obviously tracked - and the blockchain itself provides little privacy - I’m guessing state-level actors have already attached identities to most of the wallet addresses out there.
So if I hand you access to $1 billion dollars - cash or in a bank account - how could I practically get $1 billion dollars to an individual in Uganda so that they could spend the dollars?