Your English is broken and you are calling other people "mediocre". This is cringe.

You're contributing quite nicely towards the deterioration of the English language as well. Unless you can find me an English teacher who would agree "
This is frown" or "
This is smirk" are valid sentences, maybe consider not lecturing others about their grasp of the language.
Trying to understand the concept and the technology behind Bitcoin isn't that hard.The hard thing is to trust that concept and invest your time,efforts and money into Bitcoin.
But
embracing the concept is harder than simply understanding it. Most people understand the meaning behind "Not your keys, not your coins" but fewer people change their behaviour to demonstrate that understanding. Merely moving funds into Bitcoin isn't enough. Because chances are people will just lose those funds and end up disillusioned because they were approaching it all wrong. They have to adapt their mindset and their behaviour in order to get into Bitcoin safely.
Many people can't do that. It's wrong to assume they all can. Some people have spent their entire lives relying on banks and they don't know how to function any other way. They aren't ready to just dive in to Bitcoin and pretend everything will be okay.