Hm? Currencies are primarily used as a means to store and exchange value. The other things are secondary features that you may use to do things like pick between two currencies.
Y'all are getting hung up on insisting that Bitcoin is a currency, which nobody is arguing. There are important differences in the use cases that make a currency valuable to society, though. And Bitcoin is a far cry from demonstrating its value beyond the anonymous use case (or speculator use case). It is not stable or trustworthy yet, and will not be used as a reserve currency until making huge gains in both areas.