For the broad population there is no use case
False, totally false, and the problem is that you know it (i hope you understand at least this part of the BTC system).
More unsubstantiated posts. You provide no argument.
Fact is that money transfer still requires the sender and the recipient to cash in and cash out in fiat. They still pay the fees.
The argument: are people who are currently on this forum/using bitcoin not part of the 'broad population'?
If not, are you trying to say that I'm intelligent or special in some way?

Also: You found no flaw, since there is no flaw in it.
Exactly.