I use it mainly for (relatively) hands free easy use of maps/navigation, messages, music, and phone. If one's vehicle adequately comes with all of that without the need for Android Auto or Apple Carplay, then that's great and probably works well enough for you. However, my vehicle didn't come with any of those built-in (well, other than hands-free Bluetooth). So, for me Android Auto is great. And, for me personally I'd prefer to be in control of all of that as slaved to my phone, vs slaved to my vehicle manufacturer or one of their dealers for service updates/subscriptions.