The main reason stated on the white paper is that bitcoin can be used for P2P transactions, but you posted that it is foolish. If I want to send money to a friend abroad within 30 minutes or less than 1 hour and I convert fiat to bitcoin and send it to him in bitcoin. Is that foolish? Or maybe I want to send money to someone, but I do not have the necessary fiat, but he agrees to accept bitcoin which I have. Is that also foolish? I have made a payment before that I was unable to use fiat for it. Is that also foolish? You can easily convert fiat to bitcoin.
I agree. People sometimes limit themselves very much in using bitcoin, speaking of it as something that is already, at the moment, not enough. But there's always a question. Why not buy it now? Now it's still there, available, go and buy it.
The convenience that you are talking about, namely fast money transfers, in those moments when it is necessary, bitcoin simply has no equal. It is convenient in many ways, but some people literally create an icon out of it, which they pray for, saying that bitcoin does not need to be sold in any case. But I always remember that little detail when I hear such words, I remember that people are mortal, alas, and they have only one life. Limiting yourself for your entire life, saving on everything and being afraid to spend your investments , it makes no sense.