You do lose key levers when entering the euro ans Schengen. But this is a trade off and hopefully in 2022 countries do this with their eyes open. On key aspect

You do lose key levers when entering the euro ans Schengen. But this is a trade off and hopefully in 2022 countries do this with their eyes open. On key aspect is that Schengen does not harmonise immigration policy and actual external borders' security but removes internal borders. And of course the euro means the country loses control over its monetary policy.