You just made a great argument for investing MORE in GPS software in a car than in the phone: get it right the first time so you aren't stuck with useless software for two decades–that's a waste of everyone's time and money.
I'm all for awesome car nav in a car. Nice touch screen, fast updates, current traffic, up to date maps, etc.
Unfortunately every car I've seen (including some rather expensive cars) look like Maemo Mapper from my ancient (pre-android pre-iphone) Nokia 770 tablet.
However I'm weird, I have a note 4 with a replaceable battery, wireless charging, 3GB ram, and a microSD slot. A phone that could easily last 5 years. It's VERY hard to find similar on the market today.