The idea that anyone can use the force is introduced in A New Hope
That’s still not how the Force works. You don’t go from level one to one hundred in a matter of minutes, especially if you’re Sabine and didn’t really learn anything.
Luke went from struggling with a training droid to guiding a proton torpedo into an exhaust port within one day. Sabine went from sensing Ahsoka’s presence to pushing a guy a few feet within a few days.
Luke is naturally strong with the Force. Sabine isn’t. Nor does she seem to resonate strongly with the ways of the Jedi.
You don’t see a problem, from a narrative point of view, with the idea that anybody can become a powerful Force user, despite having no aptitude for it, and putting in minimal effort?
…I suppose that’s an opinion one could hold.
“The Force is an energy field that binds all living things. It surrounds us, and penetrates us. It binds the galaxy together.”
“The Force resides in all living things. But you have to be open to it.”
Practically every mentor character in Star Wars screams that anyone can use the Force, so long as they are open to it. Sabine’s arc is about opening up. The implication that one needs to be naturally strong in order to excel in the Force is antithetical to what Star Wars preaches.