Comment by mmahemoff

The good news is Apple made a more practical dual-screen device than most previous attempts. The “big square” UI was awkward for both reading and video. Apple not only made it rectangular but kept it in the magic aspect ratio that’s able to be shared by single and dual screens.

I had written off dual screen when the square layouts were the norm, but I think Apple has struck a good balance here between screen size and price+chunkiness+serviceability. I won’t be holding my breath for an iPhone Trio. (Not to be confused with Palm Treo.)