A counterpoint: my personal 2009 BMW with the "professional" navigation has aged exceptionally well having updated the maps only a couple of times. I rent cars very frequently on business trips and have yet to find any (including, annoyingly, newer BMWs) which compare in overall utility and usability unless they have CarPlay. Having said that, it's an absolute given that I will not be buying a new car without CarPlay or the future equivalent thereof.
I had an E61 BMW 5, I think the nav/system/display was good. Now I drive the 4 series and the nav/system is not much different in terms of functionality, it's just a bit more pleasant on the eyes and higher resolution. Overall, it's the same story: I don't rely on it, and when I do use it it's an amusing reminder of in-car software, but it doesn't bother me. I've sat in the newest generation cars in BMW dealerships, and it seems like it's going to be the same story [ignoring things like CarPlay].
