I mean, I’d love if Leia & Ben were in that lineup, and I think from a storytelling perspective (in the dramatic scenario where they’re both passed on in that moment, that is) it’s absolutely the right call, but I also understand how much extra work that is, especially considering how satisfied everyone is with how it looks now, both compositionally and technically.
But boy it would be nice if Rey’s master was actually behind Rey as she finally defeats Palpatine. Moving Ben’s sacrifice & resurrection of Rey is a smart idea not only for the reasons you just laid out, but because it makes this heroic culmination of the “be with me” set-up at the beginning that much stronger, with Ben AND Leia actually being with her (along with Luke, Obi-Wan, Yoda, and Anakin) when she destroys the Sith once and for all.
(I guess compositionally if you’re adding both Ben AND Leia you still get the symmetry the shot currently has - it’d just be 3 on each side instead of 2)
As it stands, it’s a bit of a dramatic failing that when Rey destroys the sith and achieves her ultimate victory, the two people closest to her at the time aren’t anywhere nearby, either spiritually or physically.
At the very least we could use some dialog (Ben possibly? Although his force ghost scene at the end might be enough). I think Leia said “The Force is with you, always”, this may work when Rey is blocking the lightening.