Another Pixel 9 Pro Fold here. I love it.
Inner screen is great for reading, which I do a lot of on my phone. Videos are nice, especially older videos with more square aspect ratios; I can even zoom in on widescreen videos where all the action is in the center for roughly the same effect.
If I didn't use my phone for documents so much it probably wouldn't be worth it, but I don't think I could go back now.
Specialization of an individual to an unfilled niche is diversification for the species as a whole.