Bitcoin is absolutely a store of value and designed as such with a emission schedule imitating that of gold. The base layer has throughput limitations that preclude it from being a 'currency' useful for general/micro transactions.
first of all you have to keep in mind that being a currency doesn't mean it can not be a store of value. in fact "money" has been considered a store of value for ages. and bitcoin is a store of value because it is a currency.
secondly limitations that the "base layer" has doesn't change anything about the fact that bitcoin is a currency. bitcoin is not just the base layer, it is a network. right now you can use it for micro transactions and in the future as the adoption grows and second layer matures you can use that for a better result.
in the end bitcoin is still a toddler and can even be considered experimental even after a decade. we are still struggling to find that balance between keeping it decentralized while maximizing the capacity and the goal from day one that Satoshi released the paper has been to create a "currency" that is why the title of the paper says "electronic cash system" not an "electronic invest and HODL system".