~Snip
To be honest, I haven't made any purchases with Bitcoin yet. But I have the intention to make purchases, for example, if I want, I can buy various software subscriptions with Bitcoin. And what you said about the increase in the price of Bitcoin, yes, your friends probably didn't know before that the price of Bitcoin would increase so much, so they paid you through Bitcoin. Maybe they didn't have a place to spend it, so they paid you. When they realized that the future of Bitcoin is very strong, they stopped paying you in Bitcoin and started paying you in fiat currency. Honestly, if I were your friend, I would have done the same thing.
Someone who adopts bitcoin as a means of payment should not think like that. Bitcoin is their currency, but they do not forget that there needs to be bitcoin in their investment portfolio. You spend bitcoin as a means of payment is not something that is considered wasteful or does not care about the potential for long-term increases, in fact with it you have used one of the functions of bitcoin as a means of payment.
I certainly agree that each of us has our own assumptions and what the purpose of buying bitcoin is and using it. Investments and currencies should be grouped differently, meaning you should be able to pick and choose between use cases and potential price increases as an investment asset.