As Mathijs explained during the webinar Webinar: Aerosoft, A Tale of Twin Otters and Xboxes
The Xbox version will have only access to Marketplace, so no modding through community folder or flightsim.to
The biggest challenge for Xbox is the memory limitation, airplanes have to be greatly optimized for memory usage, especially textures and liveries
So the PC version still keeps an advantage over Xbox in that way