alt Hacker NewsSovereignty is not a binary thing. And it's also not the case that not being a part of some structure makes you sovereign from it. In some cases it's the opposite - you need to conform anyway and have no input into the decision process. So as usual things are nuanced and not black and white.
As it happens sovereignty is a binary thing, at least when looked at domain by domain. Either you are sovereign or you are not, there is no half-sovereign.
The EU is going the federalisation way. Even now member countries relinquished sovereignty on key aspects: border control and immigration, monetary policy and currency, trade policy, and then a bunch of other things. This is hugely significant for a country.
This is just a referendum on talks so won't "seal their fate" but kudos to them for holding it.