There are plenty of weather and calculator apps on the App Store; would you really use your iPad as a flashlight or compass?
The hardware on my iPad Pro is top of the line as far as I can tell; the only real drawback versus my phone is the 1st gen Touch ID sensor, but it's not detrimental to my experience personally. As far as apps go, that's not really Apple's fault but I will say that the iPad has a far better selection of tablet-optimized apps than the competition.
EDIT: I guess Force Touch isn't on the iPad yet either, but I'm not convinced that it's a feature that would dramatically improve the user experience on such a big screen.
I just can't sympathize with this sentiment really. I've never pulled out my iPP and felt like it was a worse experience than my iPhone.
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I haven't used iOS 10 yet at all so I can't speak to that particular issue. I'm confident though that over time Apple will optimize things to make it a more appropriate experience for the big screen devices. Split screen and PiP demonstrate, IMO, that Apple recognizes that there are optimization options that can make iOS work better on a tablet; hopefully they'll continue on that path as things mature.
Can you put that calculator app in the control center?