...but the photo on the right side of the sign has the hardtop with removable sides.
I still don't undertstand why Jeep didn't make that standard on all JL hardtops; that's a missed opportunity and an epic fail on their part. Your concept has so many advantages with respect to storage, ease of removal (smaller, lighter parts), the ability to run just the hard top (so you can add roof rails), an option to have roll up side windows for pure awesomeness...the list goes on and on.
One of the things I hate about just taking the freedom tops off or even just opening the front windows (on a 2-dr JK, not sure how it is on the JKU) is the wind buffeting at speed; I usually leave the back glass open, but that's not always practical. Even sliding rear windows like the retrofit kit you came up with would help, but (and we've discussed this before) I would love it if they could pop open like minivan rear windows. Even if they were manually opened, I'd be happy! Or a removable upper barn door window that I could store inside when away from home. Someone (*cough*FCA*cough*) needs to license your ideas and bring them to market already!!
With the new model, Jeep had the chance to rethink the hardtop. Aside from the sliding sunroof option (which is neat, but not an option I would want), they've stuck with the same design as the JK, which is (relatively) heavy and awkward to remove without assistance and limits airflow through the cabin. 90% of the time I run my soft top sans windows, but I'd love to be able to do this with my hardtop for when we get an unseasonably nice day during the rest of the 9-10 months of the year when my hardtop is on. ?♂️