This is true, many people are always propagating and telling newbies that bitcoin is not an investment, bitcoin is a currency and should not be viewed as a tool to make money. But even they see bitcoin as a tool to generate profits. Honestly, I've met many people who both use bitcoin for investment and use it as currency in some cases. But I've never seen anyone not for profit treat bitcoin as a pure currency.
For many who hold bitcoin, it will currently be an investment, because in different countries it is not recognized as a means of payment, but this may change in the future.
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Things may or may not change in the future. But I wonder, for an asset that is always volatile and everyone knows it will pay off if they hold it for the long term. Are they willing to use bitcoin for daily spending? If it were me, I wouldn't do that even if it was accepted as a means of payment.
I have no reason to use something with the potential to add value in the future for everyday life while we already have fiat to do that task. Not only now but in the future, as long as bitcoin can still appreciate, not many people will use it as a currency.