About the "safety" issue. I think that some intelligence of people can be expected. And as it was said, it is possible to watch DVDs in quite a lot cars in it's factory state. Ultimately a person who really wants to do it could just attach a mount for a Tablet and watch a video there. I think all this "watch a video in the car" stuff will probably not be abused, maybe to show a short clip to a friend at a parking lot.. Anyone who is stupid enough to watch a full clip while driving and does not watch the road is basically a contender for the darwin award. A simple warning / reminder should be enough. Then everyone should judge their skills accordingly and decide for him/herself what to do and what not.
I found myself too often in a situation where i got a Whatsapp message, wanted to respond, but the stupid google voice input did not understand a single word.. So i ended up disconnecting the phone, and writing it by hand.. Or looking up something important on the phone while driving..
These days every company tends to incapacitate people by telling them what to do and what not to do. Do we really want to go on like this? Especially Android Auto does not make things safer by locking SO MANY things. Hell we can't even browse a 20-track playlist. Any normal person would then fallback to using the stock car infotainment which is often FAR less intuitive to use and might even lead to more distraction - or even unplug the phone, and use it with their hands. Btw - Apple does not block browsing as well.
There is a discussion about that here:
https://productforums.google.com/forum/#!topic/android-auto/EP2qxj9XjgY
Also i'd like to make the usage of the apps i wrote and posted safer, but it can't all be done at once. I have published the whole sourcecode into the repo, so anyone who thinks to have a solution to improve usage, without defeating the whole purpose of apps is free to do a PR.