After my last rant I have 1 coherent thought to present to you now.
I think that a large part of song leading is enhancing emotions.

This means trying to make the emotional highs higher, and making the mellow times more mellow.
When singing praises to our great God, it is inevitable that emotions will come into it, we as humans have been made as emotional beings, and our love for God has an emotional aspect. And as a song leader, part of your job is to help enhance emotional connections, help lead the congregation, not just in singing, but lead them emotionally.
For example, if your congregation (and by your congregation, I do not mean a congregation that you own) is standing there barely singing with their hands in their pockets. Then you should not be jumping around stage clapping your hands. You should be smiling and engaging with eye contact so as to lift them emotionally. The people with their hands in their pocket are telling you that they do not want to participate right now, and you have to level them up if you want them clapping.
However, if you are in the middle of “Mighty to Save” and most of your congregation is engrossed in the song, then join them in this, slow the song down, add a few extra bars before you sing the chorus again, go. acapella. Enhance their emotions.
So there’s a thought. Less coherent than I thought it would be. Please let me know if you disagree or agree with these thoughts. And maybe something coherent can come out of it.
As a side thought, a song leader does not “control” the congregation as I have alluded to, but a song leader does have the power to enhance emotions.