Everyone is different. I can type 10x faster on a touchscreen keyboard (on a phone). I remember being issued a Blackberry at work after iPhones had firmly established themselves and being horrified about how slowly I had to type. Keep in mind I'd had numerous Blackberries before and was generally happy with them, but coming back to having to depress a physical chiclet combined with less reliable autocorrect = endless frustration.

I don't begrudge pro-keyboard people their position, of course. It's a perfectly sensible preference (to the extent it's even my place to judge)!