ARC on iPad?

The main Roon app is both a remote control for the server and an endpoint. It’s not pointless if one wants to control Roon with it (and it can do much more than the ARC app). When using the iPad as an endpoint, you can choose the iPad as the output, and it definitely can output to the USB port. E.g., look that this signal path from another thread:

Depending on the DAC, it may also be possible to select the DAC as output in Settings > Audio, but this may not be the case for all DACs. See this thread, for instance:

Regarding the display, I don’t quite understand if you do or don’t want the app to use the whole screen, because you don’t seem to like it for the main app:

but seem unhappy that ARC doesn’t?

For what it’s worth, you can definitely run the main app in windowed mode if you have a modern version of iPadOS that supports windowed mode, and if your iPad is large enough. This is on a 12.9" iPad:

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