Couple to comment on while I have a second:
USB, should be able to be disabled. It would also be beneficial if the USB was hidden (for use with accessories). I do not think all that support is needed though, not directly. See next item
Mounting could be a frame/box/dock mounting for power, extended battery, all cables, etc... This could be an accessory itself. If the unit will be wall mounted it connects additional battery and cabling. If desk mounted it makes more USB ports available (assuming an office) or a simple clean dock/stand.
PoE... It would be useful if it could receive power via PoE but I would not expect it to supply it. Less cables to hook up then.
Speakers should be stereo. Even better if it could play it's audio via Bluetooth though.
Mesh units could be configured in a fallback manner to the master if it fails for some reason. But this would be optionally enabled (on by default) with the fallback order and maybe reasons selectable.