Second, the galaxy is small. What are the odds that a droid created by Anakin Skywalker ends up on a desert planet where he was originally built, and got sold to the family that happens to have Anakin’s son?

There is nothing meaningful of a random person being the hero. Especially if she has magical powers that she was born with. That’s not empowering. It’s still a message of special people get special destinies. You need a Han Solo, a person with no powers, to deliver that message.