My 2012 VW Passat’s system was the most responsive and dead-on accurate GPS I’ve ever used in a car or a phone. The only thing that beats it are handheld dedicated GPS units designed for ships and rescue workers.
That said, the maps got out of date and couldn’t be updated without a $200 SD card, which was annoying.
I have no idea about Android, but my understanding is for wired CarPlay a GPS in the dash is optional and for wireless CarPlay its required. The thinking is you can use a larger, better placed antennae. If you're using wireless CarPlay you may have your phone hidden away.