WHY ** don’t you allow us to set** vertical ** depth, so we have SOME IDEA where our fold is, without having to publish and preview ON THE EXACT PHYSICAL DEVICE. I have to use a fixed section height or container within to force a depiction of screen depth (fold), but then I’m inexplicably presented with scroll bars… there are no scroll bars on an iPad. Have you seen one recently?**
Vertical depth conditions are managed in the editor per element in the inspector, expecially when hidding unwanted scrollbars. In fixed heights, you can set the vertical at 100% or 100vh, then allow vertical (even horizontal overflow) while hiding the scrollbars.
As for dealing with exact physical devices, I don’t know if I would ever want to deal the everychanging environment of 5 types of mobile devices, 100s of different brands and versions, and all the different OS’s they use. I just deal with the averages.