I bought my Civic in 2018 and it has Android Auto. I bought it over in Toyota in part because it has Android Auto. I've been through two phones with it. The first phone was an LG, the second is a Samsung Galaxy. I primarily like it because of having Google maps up on my screen; it actually works better than the navigation systems in my parents' cars. It also makes it easier to use Google assistant; the voice prompt on my Bluetooth doesn't work with Google assistant. It doesn't work perfectly, but how it works definitely depends on how good your phone is. It works worlds better with my Galaxy than it did with my LG; my Galaxy was also much more expensive than the LG (normally; I work for a company that has a relationship with Samsung and I get steep discounts on their phones, but anyway...). I used to have all kinds of issues with apps crashing on my old LG; I don't have any issues with my Galaxy.
At least with my car, you do have to plug it in for it to connect; it doesn't just go through the Bluetooth. I just keep an extra cord in my car. It doesn't bother me because I don't always want music on in my car, so if I plug it in, the music starts, if I don't, no music. It occasionally cuts out, which I also think is because I have a cheap Amazon cable on there instead of a better quality one. I've been meaning to put a better one in there. All I usually have to do is unplug it and plug it back in.
You can also start apps from your phone and then they'll continue when you plug it in. A lot of times, I'll start my music and nav from my phone, plug it in, and then it pops up on the screen.
The app does update from your phone, not the car. It's gone through major updates since I got the car, and I just downloaded a new app and relaunched through my phone.
Overall, it's a nice feature, and it means you don't need navigation. I actually told all of the dealers I spoke to "Do not try to sell me navigation. I don't want the darn thing, and I'm not willing to pay extra, so don't even go there." Haven't once needed it; if I rarely need to drive one of my parents' cars, I still use my phone and always miss the Android auto.