I see people on youtube using the Integra goggles with the Mavic 3 series.  It's my understanding, that normal remote for the Mavic 3 (RC, RC Pro) has limited functions once the goggles are connected to the drone.

Does anyone know what these limitations are?

Hi, fdnyfish. The Integra cannot be used with the DJI RC or RC Pro. After the aircraft is linked to the goggles, a message will appear on the goggles screen stating that the remote controller is not supported when you link the aircraft to a remote controller other than DJI RC Motion 2. However, when the FPV Live function is enabled in the DJI RC Pro, the view of the connected goggles can be shared on the DJI RC Pro. Have a great day.