I agree with HAL about the saber breaking, its not only a reminder to the audience, but it brings a bit more importance to the broken saber itself, and (for me) adds a layer of simbology to it, in the image of this family’s broken legacy and now this misterious girl trying to fix it only to get it into an unstable state, as if she’s not worth of it.
i even wonder if someone should aknowledge the broken saber itself, maybe Kylo.