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I'm 42 and hate texting. I probably send between 1-10 per day but would much rather use email.
Having a phone with a responsive larger screen would probably make me hate it less, but I have a work phone so am stuck with a Samsung Galaxy Ace for the time being (which is extremely sluggish).
I'm sure the mathematicians will soon get tired of producing their own journals. It's the same as lot's of other things, sure you could do it yourself for less, but can you be arsed?
...and it's already in your pocket and most likely more powerful than the specs above. Who wants to carry another device around with them all the time?