R5 and R6II both have Bluetooth 5.0 and 5GHz wifi. RP, R and some others have Bluetooth 4.2 and 2.4 GHz Wi-Fi. Older cameras have Bluetooth 4.1. Not sure what the 5DIV has.
But from what I can gather, the Bluetooth and Wi-Fi in the cameras seem to make a difference in app performance.
Connectivity has been flawless with my R6II. Significant improvement over my RP.
