Well bitcoin fluctuates like crazy for one. It shouldn't cost me more than a dollar to make a transaction. Some exchanges charge upwards of $4/transaction now.
The vision was, you can have transactions of any value with very minimal fees. like less than 10 cents. People would have micro transactions for all sorts of things.
But what it has now become is a place to store your money. 10X growth in one year. And you can't trust your exchange to still be there when everyone tries to convert that 10X back to cash if the price were to take a dip.
I would love to see online marketplaces taking a flat fee in cents because they can bypass dumb credit card percentage based fees and can still be profitable because they are doing it at scale processing thousands of transactions a second on a digital currency