True enough. But then us drivers are unlikely to run aground or fall out of the sky
On a broader note, most inbuilt car sat-nav systems use either Garmin or TomTom's underlying technology for routing, traffic avoidance, etc. and for the most part there's not much to choose between their core technology offerings. What muddies the waters is that many car manufacturers restrict access to some of the more bespoke route management options that either manufacturer is capable of in order to simplify the end-user's choices. Whether those "simplifications" are helpful or not is another matter.
Where Google Maps and Waze score is the currency of their cartography, which is something that neither Garmin nor TomTom can compete with as they use a periodic update model. The downside of Google Maps and Waze is that they always have to download their cartography on the fly which is fine until you don't have a data connection - yes, I know you can download a local copy of sections of their cartography, but most people don't do that, and it undermines the "currency" advantage as well as limiting routing functionality.
FWIW, I've been using various Garmin navigators on motorcycles for a good 15 years and while they can have their glitches, they are supremely flexible in their routing and work very well, so I disagree that
all things Garmin are bad, even where we do have roads