I would defend it very rashly, but I can very well understand that others do not agree. I offer seven guide rules for vexillography. In my opinion, the order is very important. The second is that it must be unmistakable. The third is visibility.
Flags have to be recognized flying in the wind from a distance.
The designer has to keep that in mind all the time he is drawing. The fourth is understandability. They have to tell a story, represent hopes or history. They may also proclaim a faith. The fifth is balance.