In my opinion, bitcoin is for investments, not for purchasing common goods and services. Bitcoin is advantageous in several ways, one of it is privacy and another is bypassing currencies. I disagree regarding about the convenience. I think if you use bitcoin for investment it is more convenient because time and knowledge will be your tool for earning. Just an opinion.
Exactly very well you just explained. Why are we supposed to use bitcoins? What are their advantages? Everything just covered in the attributes bitcoin endure. The privacy, ease, convenience, more yielding in profit, famous, million users, praises and much more. Bitcoins proved themselves to use them for better future.