i dont think you will get any reply soon, very few N18 owners. If you dont mind my opinion on it. For a N17 owner perspective, appreciate what the car can do. most important is the engine, chassis, performance, fuel consumption, safety and overall drive. The tech stuff like camera, auto window, reverse camera, android stuff... is a bonus that you can live with or without. Out of habit you will learn to find ways to ignore or find alternatives for the lack of functions. My phone Google assistant cant even understand/spell most street names and ppl names... so i still have to type for navigation and calls.
Most N18 owners club say:
1. Buy a 2nd hand IP5, plug in the apple cable. USE Apple carplay.
2. Just Bluetooth your songs if that is what your main use.
3. Anything else, just buy a phone holder and use your Android phone for navigation, Youtube etc.
4. Ignore the warranty. Change the headunit to Adroid player. you probably may lose the controls on the steering column, unless the installer have a compatible plug and play connector.
Good luck. Drive a good car with no Android auto VS Drive a bad car with Android Auto. Think carefully, you can change anytime the headunit but you cant change the car.
Agree with Jessieccy's points..Arguably, there may not be such thing as perfect car. My view is that it depends on each individual to consider pros and cons of any car before deciding which one to buy. I.e. which features you want/need the most vs the ones you think may not be a deal breaker if the features/specification are not available.