You can use bitcoin as a mean of payment system over the world without without you having to exchange it for money fiat. I mean, as long as the merchant accepting bitcoin as a payment system then you just easily send your bitcoin to the marchant to buy the stuff. It will be different when you use money fiat, you have to change your money fiat against the currency where the merchant is used and it will takes a long time.

Also, bitcoin can be used as a sending money tool comparing when you will send money you have to change against the destination currency. Another advantage is bitcoin is created to resolve the inflanstory problem, comparing to money fiat that reluctant to meet inflanation depend on the economic country situation.