Here Maps has nothing to do with Huawei..I don't see how a single nav app 'surprises millions of users' about Huawei's desire to be free from Google, and further, while I like Here Maps, it is most certainly not 'stunning'.
The situation is probably very different in US but in EU Huawei managed to get most of the must to have apps (banks, government services) into their store.
I don't particularly like Huawei as a company but their hardware looks really nice and if they can give Google some competition on software side everyone will benefit.
Here was a Nokia product and back when they were in charge it was actually significantly better than Google maps.
It did not have all the bells and whistles but what it did it did really good. It was simply a well-thought product unlike Googles throw-in-everything-and-see-what-sticks Maps.