Well, that is what I mean by UEFA having to be careful with the thinking behind the group stage. Either you make sure that no one gets home court advantage, or you could make sure everybody does. Ideally IMO, they would wait until the qualifiers and the group balloting thing is done and decide the hosting venues after that.
Say you get a group like this:
England
Sweden
Bulgaria
Russia
Those are 6 games. You could always make sure that those countries get 2 games each to be played in their country in the group phase.
What would be wrong with that?