This is an oldie, but still relevant: an informative deep dive into the design choices of Google Maps and Apple Maps on iOS.
I wish I had screens from the first version of Google Maps that shipped on the iPhone, a version that was rumored to have been built by Apple for Google. To me, that's still the most usable mapping app ever for iOS, and all subsequent versions, including both of the latest versions of Google Maps and Apple Maps, are more complex. The new maps may do more and offer more functionality, but if you just wanted to quickly get directions to a particular place, nothing beat the first-gen Google Maps for iOS.
Part of this is the result of the new flat design aesthetic, which is sleek but often opaque. In many ways, touchscreen user interfaces seem to have approached a local maximum in which the only innovation is coming up with new icons that users must learn. At some point, we're just substituting new abstractions and not making significant leaps forward in usability. More apps are better, on average, than the first generation of mobile apps, but the best designed apps today don't feel much better than the best apps from the dawn of the iOS app store.
These days, the great leap forward in interface design feels like it's the complete removal of the abstraction of traditional software design. The interface that feels closest to achieving that in the near future is text, most often found in some sort of messaging interface. Following on its heels, with even greater potential as a democratic UI medium, is voice.