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VW Is Putting Buttons Back in Cars Because People Complained Enough
(www.thedrive.com)
This is a most excellent place for technology news and articles.
Yep a good rule of thumb is probably "If you aren't comfortable with having it disabled when the car is moving, don't make it a picture under glass". Managing playlists is a thing you can expect people to do when stationary, touchscreen is fine, skipping a song is done while driving, make it a button.