The overwhelming majority of people use Bitcoin and other cryptocurrencies through exchanges, they have no interest or knowledge of technical details. So it's not like technical communication has won here, more like greed and ease of use.
I agree with this completely! Bitcoin evangelist Trace Mayer always harps on keeping your private keys and not using exchanges to hold large amounts of coins. And Mayer's an investor in Kraken, one of the big exchanges. I have taught my friends this and they all had interest in it, but some skeptical if they trusted in themself enough to hold onto their coins offline.
