It is ironic that you can use your money electronically without a middle man with cryptocurrency, but people choose to leave it with a middle man regardless.
In any case, there’s a big difference between “needing a middleman” to do something and leaving your funds with a middleman indefinitely. That’s like needing to use a taxi and paying with cash versus leaving your life savings with the taxi person so some day when you maybe want to use a taxi it’ll be easier.
2. Bitcoin is very confusing and hard to learn about. But buying from an exchange makes it easy for normal people.
My point is I would rather have a team of people paid to make sure that post-it note doesn't get lost than try to keep it myself.