Live multicam

I am aware that Blackmagic allows a lot of collaborative features. I have just seen Finalcut Cam. This is Apple's own free iPhone camera app. It has lots of manual controls, like the Blackmagic camera. It also has one great feature - Multicam. If you have an iPad running Finalcut, and up to four iPhones, you can wirelessly connect them with a combination of WiFi and Bluetooth and do a very simple multi camera recording.
Just a thought, but why doesn't Blackmagic add something similar, without the requirement to go via a cloud server?
Just a thought, but why doesn't Blackmagic add something similar, without the requirement to go via a cloud server?