I think Star Wars' magic system has rules. They're philosophical rules.
If you're paying attention to The Force Awakens, you notice that Rey is losing to Kylo, up until she gets angry at him. And then her stance changes, and she starts attacking way faster. Rey used the dark side. You only notice that happening if you understand the rules of the Force. And if you do, in the next movie, you're rewarded. Luke is teaching Rey, and she goes straight to the dark. Rey is a natural dark side user, way moreso than Anakin and Luke. If you knew the magic system, you saw that coming. Now, what this subplot culminates in is Rey Palpatine, which is bad writing. But that's not the magic system's fault. The magic system did its job perfectly. It's possible to understand how magic works in Star Wars, and that gives you insight into what will happen next. That's basically a tweak on Sanderson's first law. Episodes 8 and 9 also expand on the whole dyad thingy instead of adding something new, just like Sanderson says. And The Last Jedi introduces a limitation (You can't force project this far, the effort would kill you), and then uses it later in the same movie with Luke. The underlying principles of Sanderson's laws are there. The magic has rules and the rules inform the story.
We do, at the very least, know why Gandalf's magic works. The universe was sung into being, and Gandalf is a divine being who can participate in that song. We know where his magic comes from. We know it's divine in origin.
We don't know where Harry's magic comes from. Were wizard blessed by a god? Is it a magic gene? Is it fueled by intelligence, or imagination? There are no answers.
Take horcruxes vs the one ring. One is clearly a second rate copy of the other. But the one ring has a clear limitation for Sauron: It holds most of his power, and if it's destroyed, he can be defeated. What limitation do horcruxes have for Voldemort? He has to split his soul into parts. What does that mean practically? Nothing. It's not a limitation, it's just a reason the good guys don't use it. From the council of Elrond, we know the rules of the one ring, and we know how to use them to solve a problem. Sanderson's first law. Its limitation for Sauron is more interesting than its power for Sauron. Its limitation for the Fellowship is more interesting than its power for the Fellowship. Sanderson's second law.