You're forgetting that old, less capable devices are still widely used, all around the world, and will be for many years to come.
Don't forget a basic principle of the web: Accessibility.
Don't forget a basic principle of the web: Accessibility.
Though I see a difference between access to design and access to content.
I think it is fine to just serve up a reset-CSS for 2008 blackberry devices in a few years, like some now do for IE6 browsers. I don't think it is reasonable or necessary to expect designers to create responsive designs that translate to 2008 blackberry devices (or IE6 browsers) and also work on the future devices of our choice.
Designers should be working to eliminate unnecessary and repetitive interactions that get in the way of accessing content.
My phone has high-resolution screen, but it's pretty small too, and it can easily display stuff that's a complete pain to actually read because the font size is so small.
His examples of "just fine" non-responsive designs in small windows are, well, pretty horrible.
I dunno if this guy is ego-driven ("I will never allow my beautiful site design to be besmirched just to suit its users!") or just lazy, but one thing is clear: he doesn't care very much about his users...