I think there’s enough space for an extended display to show:
All input & output meters with gain reduction.
All fader levels – these do not need to work, just show their current level.
All the mute buttons – again, these do not need to work, just show their current state).
RTA
The main parameters of at least the first two effects.
The status of any USB playback / recording.
The time
It would be nice to access this screen simply by turning the iPad to portrait orientation so that no extra buttons are required.
I think this would allow me to see all the things I can see when using an analogue desk & outboard rack.
Have I forgotten anything?