[friend_and_foe]

I wouldn't say that.

So pure trustlessness start to finish is impossible. All information exchange requires shared protocols, and this necessitates trust. The idea here is to design protocols which, once the initial setup is complete, trust is no longer a factor.

This isn't just limited to cryptocurrency, it applies to all cryptography, and more broadly, to all security measures of any kind. Key exchange requires initial trust. The idea is that you do the due diligence to get set up, then you don't have to sweat it after. To say the entire system is flawed because setup requires trust is to say that all security measures are pointless.