You lack the the economic knowledge to understand that crypto has to be turned into fiat in our day and age ?
OK, I'll take that bait. Why? Why do you think that crypto has to be turned into fiat in order to be useful? What is the use of fiat money?
Thats where trusting something like coinbase becomes a non option.
Not true. Bitcoin was conceived as a P2P electronic money system, first and foremost.