This is true, what I am missing most on MSFS on XBox ist VatSim / IVAO. I can use my whole Honeycomb and thrustmaster equipment and enjoy great graphics.
SimConnect oder FSWide support would save me about 1500 bugs to upgrade my pc, just for VatSim and Flight Tracking.
I am also missing the Navigraph moving maps on my iPad,. MSFS was the main reason to get my Series X .