You know, I really get tired of this obtuseness. Yes, it was weak. However, IT IS STATED that the ability is rare and has not been seen for thousands of years. Rey and Ben display it because of their bond. How close others were isn't relevant. They have been showing that these two share a bond not seen elsewhere.
If we follow your logic, no ability not shown in the first film should ever appear.
And I don't see it as a deus ex machina. It didn't solve the problem. It did cause Palpatine to adjust his plans; either way he was going to be resurrected, either in his own body or Rey's.
Could it have been resolved without it? Probably. But the desired denouement was the whole of the Sith vs the whole of the Jedi. That required a "healthy" Palpatine.
You don't like my analogy. Fine, all analogies are flawed. However, as I said, force users have been shown to be able to affect the world around them. Healing is not that far a stretch.
Now, I understand the paper Yoda in Mandalorian has also shown this ability. I haven't seen that show. If that is true, then they are undercutting the foundation they established here, and that is either poor writing, poor continuity, or both.
Force heal is a major ability, and it's not just rare, it literally has never been used before and there is no history for it until Rey and Ben use it. The only other time was in the clone war series when the essentially force gods transffered their life into Ashoka to bring her back to life, a being that was essentailly a god in regards to the force was needed to do what Rey and Ben did.
No if we follow my logic we will see how it's bad storytelling and bad movie making, there are plenty of movies I have seen where an out of no where power emerges and it makes a lot more sense and is done way better.
No it was pure deus ex machina. Never mentioned before, suddenly appearing out of no where, brings a dead character back all that jazz, pure deus ex machina.
Healing is a stretch because it has never been an established power outside of the games and legends canon, with the only time it appearing in the series prior was as I mentioned before, a freaking god of the force doing it.
It is true it is not a "if that is true" it bloody is you can google it and see it. So yes they have completely messed up their on premise of it potentially making some sense for Rey and Ben by them wanting to push it that it's a legit ability Jedi have and it's not special and that at the very least high level Jedis should be able to do it.