Not sure why people keep bringing this up as an alternative.
Yes it is smaller (but fatter) in your pocket, but once you fold it open to use it, it is harder to use one-handed than the 15 Pro..
Plus you get a crease in the display and a "glass" that feels cheap to the touch.
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Its a personal preference for me. Nice and compact when folded and i can use the small screen to do simpler tasks like respond to messages etc. Based on my usage i will be using it folded a lot i reckon. When i want to do 'heavier' tasks, i then have the 6.7" 120hz display (same size as Pro Max), yes may not be fully one handed when opened, but i can accept the trade off. Its basically like having a 13 mini and Pro Max in one device, and i love the look of it also and am not bothered by the crease.
I wont even go into all the fun ways you can take pics with this thing!.
I want Apple to release something similar and i will be all over it, but if they have nothing compact on the horizon in the next few years then I will do what Lioness and NT1440 have said and get a Galaxy Flip, but still use my Mac and iPads.