Would it even be approved? Apps that duplicate native functionality are seldom approved. Still not sure how Opera made it.
I've used the web version of Maps, it's nowhere near as good as native was.
One other thing that surprises me, the navigation doesn't pause what's playing when it speaks, just mutes it. That would have made more sense. That's one of those little touches. For example, the way audio stops playing if the headphone jack is pulled, that's a perfect little touch. The way audio will suspend during a phone call and seamlessly resume, that's a perfect touch. Same with how audio playback is bookmarked when you interrupt play and resumes when you reload the music app, even if it's been offloaded from active RAM. The Overdrive app (used for ebook and audiobooks from libraries) has had a bug for the last two years where it refuses to bookmark your place except when you use the 15 second rewind button. Any time I want to suspend listening I have to hit the jog or it will have a 50% chance of losing my spot and resetting to the last rewind. That's not Apple's fault, of course, but a perfect example of sloppy design work.
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Normal people also have friends and might want to put music on their computer or take music off of it. Why, here's my phone! But wait, I forgot to transfer the music to my usb keychain at home so no, we can't share. Normal people might also have laptops they take on the road with a bigger PC at home.