Point taken.
However, another important aspect is that currencies around the wolrd fulfill the same functions whereas when it comes to crypto - each token will represent anything that the creator intended it to be PLUS what the community uses it for (e.g. store of value). And each token will have a different 'design', different functions - from being tokens to enter the platform (e.g. Ethereuem itself) to tokens representing fractual ownership in assets (e.g. Maecenas art tokens or our RAT tokens representing a rat mascot, more about it here: https://medium.com/@katdum/what-did-i-learn-from-tokenizing-...).
So there will be coins that will be fulfilling the descirption of a currency (apart from the government requirement) but there will be only a few ones compared to the vast amount of tokens with different functions.
I woould like people to start using the word 'currencies' because they are not.
Following Investopedia 'Currency is a generally accepted form of money, including coins and paper notes, which is issued by a government and circulated within an economy. Used as a medium of exchange for goods and services, currency is the basis for trade.'
crypto is not generally accepted form of money;
not issued by a government;
circulated within economy - somehow yes.
I don't convert my USD to Yen and call it an "investment."
As stated below, some people do treat it as an investment to some extent.
The other thing is, in my opinion more interesting, how you define crypto. They aren't really currencies even though people call them this way. They are a different kind of asset. Sometimes compared to gold, sometimes to stocks but it might be that they are just a new type and we just don't know how to value them. And by supporting them people support the technology behind.