The limited supply and the distribution process leads to the analogy of gold. It's not hard to also see the similarity of something that was once a universally used as currency also being considered an asset and therefore an investment. While I don't disagree with what you say I think it is inevitable and unavoidable that many people will view Bitcoin as digital gold and an investment.
This is why bitcoin considered as investment because of its limited supply people think that storing this coin will give them big profit in future things that satoshi nakamoto thought would happens,he created this as an currency,to be used as payments for transactions from service to product but now it has been store from all wallets and exchanges