The front camera is used for safety features of the vehicle. Be careful because insurance companies can deny paying out accident claims if they discover you've tampered with a safety feature at all.
Mine works fine now too, on public beta 3.
Love the new CarPlay, and I hope Apple allows Google Maps and Waze to use the smaller map window on the new homescreen (rumour has it they will, but only after iOS13 goes live)
There's really no comparison. Carplay with Google Maps or Waze brings you always up to date maps, better traffic than any other solution, and intelligent routing.
Not sure if I'm understanding properly, but if your phone isn't connected to CarPlay pressing buttons on the car won't activate Siri... you would be hearing the Mazda voice controls (which suck). You can only invoke Siri from the steering wheel buttons when CarPlay is active. Otherwise you could...
You'll need to get the retrofit installed (new USB & Software) to have AA unfortunately. If nav traffic is a priority it sounds like it'll be worth it for you though.
I'd be all over this if the navigation worked with the HUD... otherwise at this cost I'm just likely going to keep mounting my phone to the air vent on the left of the steering wheel.