It’s just such a shame iOS isn’t quite ready yet to provide the kind of computing experience the hardware is clearly capable enough to deliver. If this is going to be priced like a macOS machine, it needs to offer a reasonable set of Mac style functionality - for me this means proper multi-user support so my family can all use the device with their own accounts and services and ideally some kind of windowing model for the OS to better handle multi-tasking.
iOS will need to answer a lot of questions in the next few years that it has so far steadfastly avoided. Apple bragged how these iPads can drive 5k monitors via an Xbox one S performance class GPU, but without indirect input methods (e.g. a mouse) this feature is really not much use for anything other than display mirroring. Today I only ever use video out on iOS devices for occasional video playback on TVs, I suspect I’m not alone in this.
iOS will likely either need to support a mouse or Apple will have to create some kind of standard for multi-touch external monitors that can allow iOS application input via touch on the external display if professional class workflows using multiple monitors on iOS is ever going to be a mainstream thing the way it is on the Mac.