

I think this is more getting at the expansion (reversion?) of the lore we saw in Ahsoka with regards to Sabine Wren. Its not that there only certain select people are capable of using the Force. Everyone is connected to the Force. Everyone has the potential to use it, but you have to have the right mindset/focus to do so. For some, those we call Force-sensitive, that just naturally comes more easily to them. For others, they have to train and work at it.
I think of it like making music or drawing. Everyone has the potential to make music, but some people are just naturally more inclined towards it. Some people can just pick up an instrument for the first time and play it well without practice or training. Others can still learn to make very good music, but they have to train and practice a lot. An elite music school could train anyone, but they’re going to seek out more naturally gifted people.
I’m guessing this Force healer (like Sabine) is in that latter camp. She doesn’t have a natural aptitude for the Force like Luke or Obi-Wan. But she learned how to tap into a certain aspect of it to help heal.
That’s why I think this is more of a reversion of the lore than a change or expansion. In the OT, there’s never any suggestion that only Force sensitive people can use the Force. People, including Luke and Anakin, are described as being “strong with the Force,” but that implies that others are weak with the Force.
It was the Legends EU which really created the idea that only certain people born with an innate connection had the ability to use the Force at all. Within this framing, the vast majority of people in the galaxy are simply not Force-sensitive and will never have the ability to use the Force. Among those who are Force-sensitive, the degree to which one can use the Force depends on your innately born connection to it. So someone like Luke or Anakin had very little (if any) upper limit to what they could do with the Force because they had a very strong connection. While others (like Tionne, one of Luke’s earliest students in Legends) had a very weak connection to the Force, but were still Force-sensitive in a way someone like Han Solo or Lando Calrissian never could be.
I don’t believe this is the lore that Lucas ever intended for the Force. I believe his intention was what I described above: anyone can use it with proper training, but some have a better natural inclination.