It’s kinda convenient for short trips (thus no plugging required) because it just works: it shows up on screen immediately when you get into the car, no extra movements. Also, I think cars with wireless CarPlay are equipped with wireless charging for a convenient combo.
But boy it’s enraging to use with multiple phones when you share a car with someone. It will stay connected to other person phone, while in range, and, if you to call that person, car will ring. It’s chaos… or maybe it’s just me.