Because if it is your style to get together with other people and work yourselves into a frenzy with tears streaming down your faces, you should know that you are placing yourself into a trance.
Trances are fine, especially during praying, because they put you closer to God, or to "The Field." The informational certitude of trances is closer to that of that realm than to this 3-space reality.
If you trust the person who administers the trance, this is fine.
But I don't trust most modern American churches.
So if you can't trust someone, then pray alone.