Banks use tools as a store of value by holding some assets in reserves, for various economic benefits. Although, adopting Bitcoin in such capacity, would have it's pros and cons.
What is the cons of making bitcoin a reserve in the national level? I do not see any cons about it. Only what I see are pros because bitcoin is different from the fiat the countries are using because bitcoin is deflationary. Bitcoin price may fall in short period of time but it will later increase, get to all time high and still increase more.
If there are no downsides, why aren't central banks interested in adding bitcoin to their national reserves yet? The FED or ECB have even outright stated that they have no interest or intention of adding bitcoin to their national strategic reserves.
As far as I know, national reserves need to ensure criteria such as high liquidity, safety and especially stability. Because the purpose of reserves is to be used in case of economic shocks, financial crises...meanwhile, as we all know bitcoin is often dumped whenever there is instability. Clearly, bitcoin is not suitable and does not meet the criteria to become a national reserve.