Very well said Zatanna. I was crafting a response that is very much along those lines, but not as well articulated as yours
I would like to add that, while there is usually a de facto leader for the Justice League…when it comes to those three in particular their leadership lies within the example they set, their rich history and gravitas they bring to the league, whether they’re in command or not. Superman is the moral center, with his dedication to always do good, even with all that power (sometimes in spite of it).
Wonder Woman to me is heart & soul, with all that passion she carries in everything she does. Expert warrior, skilled diplomat, yes…but it’s the fire she brings to it all that sets her apart for me.
Batman is the strategist, so dedicated to the mission, he is usually 10 steps ahead of you and always prepared for almost any scenario.
Of course they all have their weaknesses and have been shown to not be infallible. But to me, without those three, the Justice League is just not the same. Even if they are not in command, they are always leaders…and therein lies their value.