In all likelihood, insufficient coaching and rehearsal is why it feels coached and rehearsed.
A perfect presentation, which has been extremely well practiced and rehearsed, comes off as natural. Because they havent practiced it enough (and probably because many of them are simply not very good presenters, unlike say Jobs) it falls into the uncanny valley and appears unnatural.
There's also apps you just want for the integration they may provide (for example, a keyboard app) but don't want to install the entire app.
I have the Pocket app installed on my iPhone, because I want to be able to share stuff to Pocket, but I don't ever actually use the Pocket app to read stuff.
Then there are utility apps, such as the app that I used to setup my wifi, that I rarely open but still want to keep around in case something goes wrong.
There's all sorts of reasons to have apps installed but not showing in the most prime real estate in the world.
I enjoyed widgets when I used Android. Being able to keep a few key contacts 1 tap away, the weather and calendar always visible, and being able to single tap to create a new todo, another single tap to open my groceries note, etc. was pretty cool.
With the latest iphones being as fast as they are it's not a game changer to not have widgets, but I definitely found them extremely convenient.
A perfect presentation, which has been extremely well practiced and rehearsed, comes off as natural. Because they havent practiced it enough (and probably because many of them are simply not very good presenters, unlike say Jobs) it falls into the uncanny valley and appears unnatural.