What made Sauron decide to make and distribute rings, specifically? Did Sauron assume that the races really wanted rings over anything else? Would some other object also have worked to give him dominion? Why not crowns?
Also, nothing leads us to believe that Sauron needed a ring to control the other rings. He put his power into it, but couldn’t he just put his power into a magical sword to control whatever objects he made? Why did it all have to be rings?
My conclusion is that Sauron really wanted to wear a big gold ring, and justified everything else after making this decision.