Because I simply _cannot_ get much mileage out of my iphone 6s, most certainly I could not do my HN commenting (I can type ~80wpm on my laptop, and maybe ~10wpm on my phone). Plus, the screen is too small (I browse HN 200% zoomed in on my 1080p res screen... zooming on small phone screens is a pain, but easy to do on Google Chrome).
I feel like I'm missing something maybe. Other people are doing work on their smartphones, I just can't.
The mobile-only app trend (Tinder, Instagram, Snapchat, WhatsApp, etc.) drives me insane -- I'm on my laptop 14h a day, I don't want to pull out my shitty tiny mobile device when I have a perfectly good $2000 high-res, full-keyboard machine already open.
In a couple of years, all laptops will be Surface like and all major mobile OEMs will offer some kind of Continuum.
10 wpm seems really low, I just tested myself on iPhone 5S and easily got between 50 and and 60 wpm. Have you tested yourself? (www.iphonetypintest.com) I wonder if the larger iPhones actually make this harder.
Have you tried one of these? http://thewirecutter.com/reviews/the-best-bluetooth-keyboard...