i still believe in fiat, because in my offline life, there is no store that receive bitcoin as payment. because bitcoin still not accepting by every country and there are a few country that already accepting bitcoin as their payment. and if bitcoin is available on every store in my country, then maybe i use fiat as my investment

Of course, the same with my country there are not much stores that are accepting bitcoins, if I cannot use fiat then I could not survive living in our country, bitcoin is just good for online transactions and investment as well but the truth is we need the two, fiat and bitcoins.
and that is the problem of every country, may be there are few states where there will be some shops where people are accepting bitcoin in their shop, like in Brazil there are some shops where they accept bitcoin for shopping, and same is the problem in my country, i think fiat money is the main important thing in our life, with our which we cannot even thing about life, therefore i do believe on bitcoin ,
Fiat is really important part of our lives as it can be easily used everywhere and same doesn't go with bitcoin at a moment as the usage of bitcoin is very limited.