Welcome to CC
For me "prayer needs" seem to function differently for a lot of people. Let's say you had a burden for a particular person appear out of nowhere and you pray about it and you start to see things happen for that person eventually...
it didn't happen out of "nowhere"...the Lord placed it on your heart. Why? Sometimes it seems to me that it's just to get an idea of where he is in your life and what he's up to. I just sort of roll with it.
But yeah, I feel you on "but he already knows so what's the point?" I know there is a point even with this logic, I feel it pretty strongly but I only get little clues in the moment about the "why" and sometimes years afterward and while I do find myself curious about the "why" often, it seems to be simply a side trail to Godly purpose largely. Not that asking why is a problem...it certainly isn't. It's when "why" becomes a hang-up that problems begin to surface.
Lest this turn into a somewhat rambling sermonette...Hope you enjoy your time here. Feel free to reach out to folks roundabout if you see someone you think you might connect with. Take care.