It seems Bitcoin Core has embraced the digital gold narrative, which fails to achieve the original goal of P2P electronic cash. Do these developers really know better?
There isn't a single or right concept of how you should use your coins. If Bitcoin fits the function of investment for your life, then use it as investment, but if it suits better as currency for daily transactions, use Bitcoin as currency. It's not the developers who know better, but each individual who decide how they should use Bitcoin taking into consideration their needs on the present time.
The point is that Bitcoin has to be benefical for you along the years. After all, it exists to serve us, and not the opposite. Bitcoin is the tool so you can reach your objectives. Bitcoin is the middle, not the end.