Let's just take for instance you have an emergency fund, and from time to time you add some amount of money to your emergency fund account. For a long time, there were no emergency situations that warranted spending the money. Due to the characteristics of fiat, which normally depreciates, can the emergency fund be invested in Bitcoin?
Given that bitcoin is volatile and cyclical (periods of bearish and bullish trends), I would only allow partial investment in bitcoin from the reserve fund. Why? A reserve fund is an emergency fund because it can be needed at any time (for medical treatment or other urgent expenses), so it should be held in liquid assets (cash, for example). A situation could arise where your reserve fund is invested in bitcoin, and bitcoin has depreciated by half (as it has now, relative to ATH) since your initial investment, and you urgently need the money. Sell at a loss? You'll simply have no choice and will have to take this step. Therefore, to avoid unexpected losses, the majority of the reserve fund should be held in traditional financial assets. I understand that this fund will be subject to inflation, but that's the lesser evil will have to live with.
The reason why I'm asking is that some countries have reserves, and it is in Bitcoin. Emergency reserves and funds have some similarities, so my question is, does it make any sense for the emergency fund to be invested in Bitcoin if there has been no emergency for a long time and you think keeping it in fiat is making its value meaningless.
Now the question concerns not just an individual, but an entire country? Firstly, countries are not yet entirely positive about bitcoin, and their complete trust in this asset is out of the question.
Investing from a country's reserve fund in bitcoin carries the same risks (temporary depreciation of the asset), but with far more dire consequences, since it's not just one life at stake, but the lives of the entire country's residents. On the other hand, allowing the funds to depreciate due to inflation is equally unwise. Therefore, perhaps the following compromise is possible: diversification, i.e., investing money from the reserve fund in various assets (with high liquidity), and not just bitcoin.