Any chance of adding a faint “let go” from obi-wan as Luke becomes one with the force?
Seems unnecessary, and like it might distract from the emotional core of the scene.
On the contrary, I think it would give a lot more closure to the scene, it would better illustrate that he leaves the physical plain out of choice and not because of his weakness, having obi-wan be part of his final moments would feel quite wholesome as well as it being a nice call back to ANH.