alistair it’s one step removed. Do you know what the average turnout is at EU elections in the UK? About 25%. No one gives a fuck. You call that democratic legitimacy.
The fact that people don’t bother to vote for something despite the fact that they can is not really the same thing as there being a lack of democratic accountability.
The European Commission has similarities to the UK Civil Service, which isn’t voted for either. It’s a workhorse of intelligent and qualified minds that is ultimately accountable to and sits underneath the elected bodies.