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iTunes is clunky, confusing, and conflicts with Music
When was the last time you used iTunes, the version on your iPhone? Likely "rarely" or "never." Yes, you can download music and video on the go and this should be its sole purpose, so why not wrap it into the App Store, or wrap the App Store into iTunes? It seems redundant and rarely used. Music is where you listen to your, well, music.
FaceTime is free, but unreliable and patchy at best
Ever seen someone jiggling about with a green flashing screen? Ever suffered a dropped call? Maybe not, because many are spending minutes at a time while FaceTime is "connecting" you to the recipient of the video call. Yes, FaceTime is free but it's frequently patchy at best.
Spotlight's last resort: Wikipedia, or the Web
Does anyone use the search feature in iOS? Some do, granted, but it's hardly comparable to rival platforms. When Spotlight can find something, it'll find it. If Spotlight can't find something, you're stuck with either Wikipedia or "the Web," an Internet search. Why can't Spotlight utilize some of the non-voice features of Siri, which seems to know practically everything?