His blaster wound not healing was a metaphor of him being independent from the movement and not being able to move on from his trauma. He's fighting accepting his losses when he's fighting getting force healing. The act of getting it is him accepting he can't do everything independently, and that he is part of the movement, no longer and individual, and moving on from his losses. Not necessarily that he WILL die, but that it's irrelevant because he has decided his path. That's what allows his trauma to start healing.
This concept could be handled in countless other ways. My main gripe is that the show and rogue one focused on how the rebellion wasn't built on zealotry or a single hero but the sacrifice and grind and passion of a great many people working together.
But it's Star Wars, they gotta jam some lucas spam in there somewhere. I'm glad it was limited to this.
I wasn't saying it was the first. I was just saying that THIS back story, Andor + Rogue One, makes it good in a way that the OT stands worse off without. Andor especially with just how god damn well researched, written, cast, and acted it is. The rebellion is given body, history, and character instead of just existing because it has to because the empire exists. The Jedi's story is improved because of the story of the non-superpowered people on which their quest is given merit and a foundation.
I'm not a big enough SW fan in general to spend my precious little reading time on SW comics and books. I'm sure there's lots of merit in them, but not for me when there's so much else to read in far more interesting universes.