Are ceramic bearings worth it? Definitely not - I agree with all of you.
But, they do make a tiny difference. If you spent $2000 at Ceramic Speed and bought everything they sell you might save a cumulative 3-4 watts. It might be worth it for a world tour rider and it’s still less than 1% of their threshold.
As previous said - aero road helmet 10 watts - aero road bars - 5 watts - wheels - everything is cheaper watts.