What's funny to me is in the time I've owned and used the mini 5 since the day it was released, I never noticed the jelly scroll when in landscape mode, probably because I use my iPads in portrait mode for the majority of my browsing/reading. And maybe since the screen is wider in landscape mode the jelly scroll effect seems to be less pronounced to me.
Speaking rhetorically here, is this likely some sort of hardware thing, like Apple switched the manner of refresh for the display controller or something? Is this refresh/timing thing software controlled and they can just issue a software update to "swap" it back? It just seems so prominent in the way that the majority of people would use/hold their iPads, or at least their minis.