It does trivializes many elements though, I mean you point to a great example with Qui Gon. He literally dies from the same wound that Rey inflicts on Kylo and subsequently saves him from death.
My point is that it's so undefined how and who can heal that it makes you question everything, that is the problem.
Yeah, I don't think there's any hard written rules established on how the force works, and the prequels and sequels are written in a clunky manner, still, I think the logic to no save someone like Qui Gon when it may have been possible for someone with healing knowledge was due to their beliefs of returning to the force after death, which made Obi Wan and Yoda face their own deaths without fear.
Another of the idiosyncrasies of the Jedi that may have prevented them to try to save a dying person may be their detachment from everything in a sentimental way, for better or for worse. That way of thinking was what lead to the weird rule of forbidding romantic relationships to the members of their order.
Rei didn't carried any of that baggage since she wasn't formally trained by a master Jedi, so she could revive a dead Kylo just because she could. On top of that, Luke and Yoda realized that the Jedi order was stupid in some ways, so I guess that love being what saved everyone at the end (as cheesy as it is) kind of fits with Yoda burning the old Jedi texts, since they thought of attachment as a path to the dark side.
