I guess it’s going to be 80/20 on your requirements. It can’t be as reliable as Google Android
- apart from the official doc, there’s two threads on the AA experience with recent entries, search for “android auto” + in:title, sorted by “latest post”. It works, but additional config is needed to have more Apps show up. Wireless… no clear statement on this
- reads to me like both, but I’m no AA user to be reliable
- (?) needs an FP6 user to answer
- according to this, Google fast roaming implementation seems sufficient, but wifi stacks can be tied to device firmware, so your FP6 experience can differ to Pixels, FP6 user where?
- as a centerpiece of /e/, that all works with a built-in davx5 fork
- 1-8 I’d be positive. There’s some support in microG for the Billing API (even if it’s not yet in their wiki status) - the playservice surrogate. What you already bought can be installed. It’s an experimental feature but when enabled you seem to be even able to buy. YMMV. Banking apps cause most friction, but lots of do work. I’m wary to speak on travel apps. There are compatibility databases.