Im not going to get into the apps that people will boast about like waze since it wont apply to some people (like me) but all its basically doing is mirroring the android auto interface of your phone. You will need to have it plugged in which is an extra step people must do when getting into the car to use it. All its really doing is giving you a slightly larger screen to show your phone screen (not fully mirror the entire phone) on AA interface. Also worth noting that not all apps are usable only the ones that android auto supports. I have not installed it myself but I believe you get functionality with the console knob controller also so you dont have to use the touchscreen but I could be mistaken about this.
You will still need to use your phones data, processing power, space etc for whatever. The mazda unit is basically just an external monitor for AA/CP.
Do not confuse this with aftermarket android headunits such as joyingAuto or Pumpkin which provide a full android OS headunit with standalone app support basically like a tablet running full android. AA/CP additions are not really adding any standalone value since you can basically use your phone to do the exact same thing if you pop it on a dash/window/or vent mount clip. But to some the extra convenience is worth the price.
Note:I wrote this in the android prespective but same thing will apply to apple also.
This upgrade allows your phone to be directly managed as a disply on your infotainment screen.
Where regular BlueTooth (audio/phone) allows your phone to run through your audio system, the Carplay upgrade allows you to manipulate your phone as if you had placed it on holder at the level of your screen, and allows you to use the infotainment button / audio button on your center console to toggle through the apps, etc.
The advantages for this, are that you don't have to keep reaching for your phone, to receive text, manage your audiobooks, manage your Google Maps or Waze, or Apple Maps, or PodCast apps, or Text Messages. If you've ever put your phone away, wishing you didn't have to reach for it, but wished you could have the advantages of using a limited number of driving-safe apps, then you might want to consider this.
It's not for everyone, but I have found it so indispensible, that all my cars have been upgraded to CarPlay one way (dealer upgrade) or another (aftermarket stereo).
If you use your phone as a workhorse, and see the advantage of it as a tool instead of a mere novelty or distraction, A/A Carplay will then allow you to use your car as a similar tool while you're driving. At least I have. Good luck!
Want to replace the stock speakers in my daughter's 2019 CX-3 and cannot find any video on how to do that on this specific year model. I've seen quite a few on older CX-3 or Mazda 3, but 2019 does not have the same door configuration so I don't know where the 2 screws are or how to...