bitcoin is a store of value because it is a medium of exchange. otherwise you would be storing some virtual numbers in a very expensive database without any value.

bitcoin transactions are super fast. it takes literary 1 second, or 3 worst case scenario to propagate a transaction throughout the entire bitcoin network that is spread across the globe. and fees aren't that high most of the times  but i agree that they should be lower.

that is your assumption.
millions of dollars worth of transaction is being processed by BitPay alone which means people are using bitcoin "to buy stuff" and that is not even considering other payment processors such as Coinbase, etc or even the merchants that accept bitcoin directly both in online and offline shops.