Relies on the cloud?
Well I'm out then. Hopefully the iOS native PDF reader will adopt similar functionality, it is annoying having to turn my phone to landscape or pinch/zoom/scroll to read a PDF on a phone so this is a problem that needed to be solved. Just not like Adobe did.
Seems to me that it should be easy enough to do without requiring either "cloud" or "AI". There also needs to be a simple toggle to enable/disable it, since sometimes you want to view the document in its original form even if that makes it unwieldy - something like Safari's "reader mode" toggle would be perfect for that.