I honestly do not understand this. What is wrong with spending bitcoins on something? Unless you are 100% btc, spending fiat instead of bitcoins to buy something does not mean anything.
I spend 10USD on a subway or btc equivalent. If I am saying spending BTC is dumb because in a few years that btc will be worth more, should I not have all my money in BTC then? Why would you even have fiat if you believe that? You realise you can replace the btc you spend with more btc right? Any fiat is potential btc! So spending fiat is really spending btc.
Do I even make sense? Ugh