As a digital currency, Bitcoin has those features that you have outlined and other more which you didn't mention one of which is Bitcoin serving as a strategic reserve for nations.

About what I think? I want you to first take note that you can use your Bitcoin for anything you want, it depends on your needs at that moment. If you want to spend your Bitcoin in purchasing any item you need, then it's up to you to use it for any form of p2p transaction you want but that doesn't still stop your from having some more Bitcoin in your cold storage for investment.

For example, i can have 1 Bitcoin in my cold storage that am holding as an investment, while I can also have 0.08 Bitcoin in a hot wallet and maybe what I only use that one for is making payments for goods and services.  

Having Bitcoin doesn't limit you to only using one of its features, you can spend some and still hold some as your investment which is the major reason of holding Bitcoin by a lot of people.