It can't be logical until Bitcoin becomes stable. All those monetary reserves are first of all made to save the money and not to get any profits out of it. So bitcoin can't be reserve currency for such a big country like Russi then first it should become stable to secure the financial safety of the country and then it should have enough liquidity to make it possible to use this money. For this time we don't even have enough liquidity for that.
One must know that what you said are the basics of how an economy makes money. They can't probably trust bitcoin that big to use it as a reserve currency for a country powerful as them as that can tantamount to fearmongers and FUDs in the cryptomarket and also in the economics world. The liquidity is one of the few things they should consider as this can be a great thing or a disaster in the making.
There are serious risks with the industry but we can agree that there are advantages as well to the new technology
The adoption process might progress more but we will never know since the market's stability is one of the things people took note of the cryptocurrency market. Either way, they could be scheming something out of it.