I believe bitcoin is created to be used as a currency, but I don’t think the government is open about that. It’s rare to see shops and stores in my country who accept bitcoin as a payment system. Therefore, it’s not surprising why majority fall on seeing bitcoin as an investment asset, and add to that wherein its value is always on the rise, then hodling bitcoin creates more essence having it as an investment. People resort to fiat when spending, while they continue to save bitcoin.
The actual use cases for bitcoin as a means of payment or currency depend heavily on government regulations. If your country's government doesn't legalize bitcoin as a means of payment, you probably won't find any physical establishments that accept it. In this case, you can still use bitcoin as a means of payment, but it must be done screetly. My country doesn't legalize bitcoin as a means of payment, so I'm not surprised I haven't found a single place that accepts bitcoin or any altcoin.
Re: Do you consider bitcoin as a currency or as a digital investment asset
Investment assets, not as a means of payment or currency.