Your analysis is so on point. I think there's a good reason that Camila and KG sing the majority of the chorus, because that choreo is pretty intense while they're sitting there hitting those sustained notes. Also KG singing while doing that floorwork is something else!
Yo fr yes XO Call Me was amazing, I would love a performance video at least for it! As for this performance video, the choreo went WAY harder than I thought it did originally from the MV, like they have those girls doing back kicks on the floor and shit I was shook! Shout out to KG specifically for being able to do ANY of this, she wouldn't have been able to do any of this like a year ago so her growth in particular is wild!
Title tracks are always meant to be "consumable". It's why everyone always shits on NMIXX lol cause their change ups throw people off. XO Call Me is good to keep as a B-side. I don't think it fits their image when everything they've done so far has been about girl power. They're essentially relegated to puppy love songs until Kaylee is at least 16/17, so there's still 2/3 years yet to go before their creative director probably tries to put them into that kind of position. If i'm their director, i am avoiding any potential way the girls can get sexualized like the plague. That means we singing bout girl problems, and rising to the occasion lol People already making a deal about the part in the choreography where they all bend down to the floor and then do a glide into a new position.