While this is fantasy: imagine if you could put on an AR headset and be able to "look through the plane" in any direction. Like that F-35 AR helmet. Maybe allow people to use their screens to also look out around the plane using the same system.
It may have been more of a Cold War thing, but I seem to remember running into that in a book at some point that there was a tacit agreement to not do that in the interest of not turning civil transport aircraft into mass produced intelligence gathering platforms, therefore in theory rendering them completely neutral in reference to needing to be taken into account in international sales/intelligence gathering.
I may be completely wrong or misinformed on that though; or the info may have been valid, but hasn't aged well taking into account how capabilities have evolved.
On the other hand I had no problems getting some good but very distant pictures of Havana a year and a half ago when our cruise ship sailed past.
[1] https://www.theverge.com/2017/12/1/16723152/emirates-first-c...
That said the last time I flew east to west across the U.S., I was glued to the window as we crossed Utah. Killer views of canyonlands and mountain ranges. I found it was at least as impressive to view them from 35k feet as it was on the ground.
Also I see no added value of doing this on a plane as opposed to doing the same thing at home with the flight path pre-recorded or even being able to pick from multiple pre-recorded ones.