They are deciding about life and death of people of a country (or many). They're not discussing about what's your favourite food and which sex position you like the most.
Those conversation MUST be open and public, so people can judge the work of their delegates and decide to vote them again or not.
If you don't want to be heard, don't present yourself as a candidate. There are plenty of roles in companies that are private enough to speak privately.
Eurogroup, Ecofin, European Commission, European Central Bank, ESM are secrets just to subtract power from citizens, so to reduce democracy.