Yes, they can exist together and no one should take that bitcoin is better, or fiat is better. Both has its places and people should make the most out of it. Right now bitcoin is not yet mass adopted, so I doubt it could be better than fiat.
Actually, everything has its own purpose.
I think cryptocurrencies ha e some differences than fiat that's all.
But how can you make the best out of bitcoin if you are not going to convert it to fiat? Of course we enjoy that freedom because we are our own bank, however, we also need to remain our self that in order to really used bitcoin we need it first converted to fiat and then buy the things we want because its not yet universally accepted. And besides, it feels good holding fiat or gold because they are physical.
Well said. We don't really have to find which one is better since there is no exact better between these fiat currencies and other coins. There are several factors and paramters which makes them better or worse. For example, with fiat money, you can make shopping everywhere while you can't spend your bitcoin in your small local shopping mall. For bitcoin, we don't have physical environments to put it, for money, we need. We can multiply the examples.