Considering the show was trying to focus on Epcot's past...no, it wouldn't have been disingenuous to not include any IP songs.
But they did, and that's a tone-deaf decision which downright sours a "ok" show. Personally I feel you could easily make a tribute show with the treasure trove of music the past attractions provided, yet there were some questionable decisions here. (Really? Eric Idle's version of Imagination?) An that Aladdin song to cap it off is certainly a choice, since I think it's safe to say when you're more celebrating the past...you're not wanting to look to the future right this moment.