True, but currently only Apple Maps works in the split-screen mode... neither Waze nor Google Maps work there... I hope it's something that just requires an app update by Waze and Google, as opposed to some arbitrary restriction imposed by Apple. I suspect this is the case, as that's how it works with the audio piece... every audio app I've tried (Spotify, Outcast, iHeartRadio) all work fine in the split-screen mode. Here's to hoping the other maps apps work as well, once they have been updated.
I also use Fantastical2 as my calendar, but since it's using the Apple Calendar feed, it works well, too.
I use Waze almost exclusively for maps in my cars, and usually either Spotify or Outcast for audio... so I still spend a lot of time switching between apps.
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My wife does the same... but I have an older car (2010 Mazda MX-5), with no navigation, etc... stuck an Alpine ILX-107 in there and never looked back. Now, when I am driving her car (Ford Edge), I fire up CarPlay and I'm a happy guy.