I don't know if I'm oblivious - on long drives I usually have the TomTom setup and Waze on the android auto screen - TomTom knows about traffic and issues on the road that are just not on Waze, most of the time. Also Waze keeps directing me on most idiotic side little roads, recently I nearly got stuck in a muddy road somewhere in the British countryside because of Waze because I decided to trust it. Again, no such problem with TomTom.

Mhm - note that with "TomTom" I now mean Android app (which has Android Auto integration) and not an old standalone device :)

I've also seen that same very app as a builtin navigation with all the features (including live traffic) in a new Fiat 500e, so it seems like they're licensing the tech to car manufacturers.

Despite having my area downloaded in Google Maps, the navigation and recommended routes won't load in my garage. It usually fails horribly (mostly because, like many poorly programmed mobile apps, it doesn't handle scenarios with poor connectivity well).

I've had some pretty poor experiences with offline maps on Google Maps. There have been a few times where I've made a point to download the maps for an area a couple of days ahead of time because I knew service would be spotty. I would then drive out to the areas with spotty connectivity, and more often than not Google Maps would refuse to generate a route for a route definitely within the confines of the selected offline map. I'd have to drive back a bit by memory to find reception and then try to generate the route again. This would even happen if I was on a route, cancelled it for some reason, and then attempted to restart the exact same route while along the route it was just on.

Google Maps offline has been extremely unreliable for me and mostly unreliable when I had the greatest need for it. This was true years ago and this was true less than a month ago.

If I'm going to someplace with spotty connectivity, I make sure to put in all the main addresses and locations on my car's navigation system ahead of time. The maps might be dated but at least it'll generate a route somewhat towards the destination, even if I might need to take a detour along the way.

You can only download them in explicitly specified chunks (not e.g. one whole state, much less whole country), and they expire if you don't update them regularly.