Well, the quality of the "typical website" (aimed at desktop browsers) certainly seems to support that conclusion...
There's certainly a very different mindset you adopt when developing for a phone sized screen, and the constraints require super tight focus on the site goals and processes that is often missing from the planning and requirements stage of less-constrained web development.
Google the "mobile first" movement, and pay particular attention for the writing of Luke Wroblewski - while not fully subscribing to "mobile first" myself, I'm seeing some _strong_ benefits from at least considering it at the very early planning stages of any new web project.
There's certainly a very different mindset you adopt when developing for a phone sized screen, and the constraints require super tight focus on the site goals and processes that is often missing from the planning and requirements stage of less-constrained web development.
Google the "mobile first" movement, and pay particular attention for the writing of Luke Wroblewski - while not fully subscribing to "mobile first" myself, I'm seeing some _strong_ benefits from at least considering it at the very early planning stages of any new web project.