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There are some reasons why so far, Bitcoin is not fully used as a payment method, because of regu;ation.
We can only count how many countries that accept Bitcoin as a legal tender, that allows Bitcoin to be used as a payment method, as a currency.
And, we cannot blame people who do not use BTC for a currency, because they cannot, due to the strict of each regulation that is probably set in each country.
The basic goal of Bitcoin is yes, as a currency, but for this time, this can not be fully used and adopted. Bitcoin is really important for a global currency, I do really agree moreover with the advantages that are offered to use Bitcoin as a global payment. But once more, so far, not many companies or merchants can accept Bitcoin as a payment method.
The goal of Bitcoin seems to be invested right now, using HODL and even trading assets for circulation.