
Again not true. Also again, prayer is not about usefulness. The fact you view it that way is why you probably don’t believe in God. The fact you keep saying prayer is about usefulness is telling that you have self serving motivations in your faith when the whole point is dethroning the self.
I wish I had a special explanation to satisfy your sensibilities, but prayer is about connecting with God and the motivations with which you enter prayer. We can ask for stuff, but that’s not what it’s about, and maybe the things we ask for aren’t always guaranteed, or maybe the stuff we ask for isn’t the best and we don’t know it.