Not good! I am 100% sure that we do not want countries to create their strategic Bitcoin reserve at all. Bitcoin is supposed to be a currency system of the common people. With corporates and countries entering into the Bitcoin, it's going beyond the reach of the common people. We are not realising it now, but in a couple of years a scarcity will be created.
I partly agree, but not because of fears about "scarcity". This is already happening: ETFs, Saylor, and other big Bitcoin buyers made Bitcoin more scarce this year already. In reality, since its inception Bitcoin is getting more scarce (in the long term), because there seems to be a growing demand surplus, and since at least 2015 it's out of reach for most people to mine Bitcoin. And thus, the price, as an indicator for scarcity, is increasing.
What the community should worry about are too strong individual governments or central banks, i.e. single entities holding extreme positions (e.g. millions), because these could indeed
become too powerful (imo). We don't want Bitcoin to become a typical altcoin like ETH, where Vitalik Buterin alone could force a hard fork due to his immense holdings. Thus in a scenario where Bitcoin is used as a strategic reserve, it's better if this reserve is distributed.
Brazil is at least not talking about millions like Lummins does in the US, so I guess they're talking about a few thousands or at most 100.000
BTC in the long term (and as I wrote in an earlier post, approval of this bill is quite unlikely). If all Central Bank Bitcoin reserves total to a million approximately and none has more than 20% of these, then I see no dangers for the Bitcoin power equilibrium.