Covid sort of showed everyone how hard it is to survive as a small economy in the modern highly interdependent world.
One small disruptor to a core component of a small economy and they are standing outside the IMF to survive.
There are currently 50-60 small countries that depend on borrowing from the IMF (that too in dollars paying interest in dollars - given competition levels guess what dollar generating capacities small economies have? They end up economic vassals of larger systems or selling off national assets or being used in geopolitical games).
On the other hand look at China and India. They have more provinces/states than the EU and larger populations. Vastly differently economies spanning all those subunits. Yet you wont find any of those subunits complaining about their central bank setting monetary policy.
Why? Cuz look at the surroundings - Sri Lanka/Pakistan/Myanmar/Bangladesh/Thailand/Indonesia/even South Korea all at one point or another requiring the IMF to step in and bail them out when they ran into trouble.
The world is too complex and fast/ever changing and small economies are increasingly dependent on larger economies to manage the unknowns and unpredictability that lie ahead. Its almost become impossible to survive by themselves. Sort of like running a book store in the era of Amazon.