One of the selling points of Apple devices is that their software is [1] just _nice_ to use, letting you do what you need to do, without having to keep you in and monetize you otherwise.

Is Mail.app the most powerful client on earth? No; but it is Good Enough, and I don't have to download and pay for a third party app. Is Weather.app the best weather app with all the bells and whistles possible? No; but I don't care about weather apps to download and trial fifteen other ones and It Just Works.

Maps are (orders of magnitude) more complicated; but arguably are also on the baseline level of functionality for a modern mobile OS.

And Maps.app is just so much _nicer_ to use than Google Maps. It has the same problems that all Apple products like it does (search is atrocious, POI db is bad); but it is just a much more pleasant product. It looks nicer, it _feels_ nicer, it has best-in-class transit directions, and doesn't shove ads in front of my face.

[1]: Arguably getting worse and worse at it every year; but still miles ahead of everyone else.