I sometimes think I over think all this. I almost never need sat nav because, 95% of the time, I'm going somewhere I've already been!
When I had my very first sat nav - a Navman - I never updated it and it got me where I needed to go for 5 years or more.
I do understand, however, not everybody has my driving profile and traffic updates can be be very useful hence my interest in Android Auto - I've downloaded the App and I've got the right connector (my phone won't support wireless connection).
I was just reflecting - back in the day I used to drive through France on Euro Camp holidays with the kids and sat navs weren't a thing back then. I often wonder how I did it!