That's not an argument that makes much sense to me, because we do things every day that require a great deal of context and training. At some point someone taught us how to operate a steel missile that burns hydrocarbons to propel us onto a road network where we need to be able to interpret symbols, colors, and complex pre-arranged maneuvers in order to allow us to negotiate this system and not die. That took maybe a few weeks to figure out.

Crypto is not hard, it's in fact quite simple. It's just a matter of training people on a couple of simple rules. You don't need any pre-existing skills, you don't need any expensive equipment, you just need to be motivated to spend a few hours learning a new thing.