To add to this frustration, I don’t think the IMAX version I saw when TFA was in theatres even properly showed the IMAX scenes. The film was presented at my IMAX theatre in 2.39:1 throughout the entire film with no changes to widen the frame during the IMAX portions.
That’s not rare. I believe there were less than 20 theatres that showed it the way it was supposed to be seen, which was on proper IMAX film with the matte opened up during the Falcon chase.
I was at an IMAX on an opening night (front row, so it was terrible) and it was the same aspect ratio through the whole thing.