I have seen several related tickets on the issue of jerky scrolling on iOS. I have made a video demonstrating the issue which I have experienced I will try and link here.
This seems to indicate that whilst the scrolling performance of the iOS roon app is not perfect there is an issue with 120fps (pro-motion?) that is specific to some iOS devices and that it is believed has been successfully addressed by your dev team. I can report that the scrolling performance is still significantly better (but still not a smooth as with safari) if I enable screen recording and therefore the 120 fps is not being used on my devices when scrolling in roon.
Considering that it’s been an issue since the first ProMotion 120hz displays were released, I’m guess not anytime soon, if ever.
ARC which I’ve heard is Flutter based doesn’t have the same issue, so it’s probably some technical issue with the still Xamarin or MAUI based Roon iOS apps. Just a guess.