Different strokes I guess. Maps are a small part of using Carplay for me. Mostly it's about having voice command access to messaging/calling/podcasts/music/audiobooks and maps. I don't see an issue with leaving a cable plugged into the car and just connecting/disconnecting when you get in/out. My previous car, the iX35, came with a free lightning cable just to leave in the car for this purpose.
Sure, if you're not a big phone user and it lives in your back rather than your pocket I can see that wouldn't be an attractive prospect. I've always had my phone connected in my car, even when i didn't have a head unit for it to play through. Driving is one of the best opportunities for me to charge my phone which is why I've always connected it the moment I get in.