I don't know the answer to your question as I have been stuck in EOW for the same amount of time you've been divorced. But that won't stop me from answering!
Maybe your X told you why she seeks the change, though her reasons should be meaningless to you.
Your D16 is either in, or will be starting HS, and her activities that do not include mom and Dad will increase significantly. This is natural and healthy (behind keeping up grades), so it seems fewer changes between homes would simplify her life. And since you already know her schedule, you can probably slip in a dinner or something during the "week off." "Hey sweetie, are you hungry?" works GREAT for me.
The kids are old enough now where you can ask them how it may affect them, and what they think, after you have already analyzed for yourself. Of course if you determine the change will not work for you, you won't bother raising it with them. But if you decide for it, or are truly agnostic on the issue, their input will help, and they will feel good that you are including them in the discussion.
If you and your X decide to change, and since you seem to have a cordial relationship, maybe you can discuss it with the kids together at a lunch meeting.
Okay, lots of blather about which you didn't ask. Plenty of guys with WOWo schedules will surely comment.
"Personal density is directly proportional to temporal bandwidth."