Not at all. The poster says that he was 'saved' after dropping his iPhone into the pool because he could email off his iPad. You can email off a plethora of non-Apple devices and as for iMessage, it is only any good if the recipient of your messages has an Apple device...which kinda limits the value of it in an 'emergency' situation.
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The Samsung S5 wins a fair few benchmark tests against the iPhone 5S:
http://www.anandtech.com/show/7903/samsung-galaxy-s-5-review/7
Yes, he could email/imessage off his ipad much easier, because the environment, contacts, email accounts, messages are virtually replicated on the ipad in a secure manner via icloud. Sure you can email virtually from any computer, but unless your contacts, names, addresses, birthdays and the like are in every email system, it's not quite the same thing. So if you are saying any old email client is any old email client then Hyundai Elantra equals a Bugatti.
As far as the benchmarks the big lose for iphone 5S is some of the graphics benchmarks. So unless your sole purpose for owning an iphone is playing games, then common things; like browsing, picture talking, o/s fluidity and the like go to iphone. Frankly I care more about how fast I can get the camera app started and start taking pictures than how fast graphics are for games. I'm sure there are others that would agree with that statement. And there are some benchmarks the 5S just dominates the particular benchmark. Additionally, I have not heard anyone complain the games that require intensive graphics are sub-par on the 5S, although I'm sure they may be some.
One more thing as far as imessage being of limited value in an emergency, if your whole family has an iphone and that is who you want to contact, then it clearly is not of limited value; the same for facetime. Non-ios receipts go out as SMS anyway. If you don't have an SMS plan, then SMS is the limiting factor, which has nothing to do with iphone.
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