As an engineer and computer science grad, i understand it very well. This is the reason and it will trigger plenty of cognitive dissonance: Here it is: it works, has issues with cost, blockchain cost, processing bandwidth ....
But THE ENDPOINTS ARE COMPROMISED BY INTERNATIONAL INTELLIGENCE AGENCIES and your HARDWARE cannot be changed. An endpoint is "where you type" They intercept everything and don't decrypt...THEY STEAL PASSWORDS AND KEYS! YOU CANNOT STOP THEM. Im sorry nothing is secure even offline stuff. Even baremetal code in Trezor is compromised as the ARM core can be triggered by a sequentially read stream (ie bogus blockchain) when activated it loads a root level program which then runs to tragan your device. Sorry but new world order wants you demoralized and bankrupt especially those red pilled.