Motion Controller for DJI FPV Combo

You can fly it without wearing them but you do need to have them with you and powered on.

It binds directly to to the DJI FPV drone, not a phone.

You can use the DJI Fly App to update the firmware of all those drones listed.

No. DJI FPV drone only at this point, and requires you link and authorize it using the DJI app which only works on certain phones (though it doesn't use the phone to actually fly AT ALL).