You're right, of course, but if Android devs start following the tablet style guide, which encourages them to split their app into fragments that might display full-screen on a phone and share the screen on a tablet, then it becomes relatively straightforward for a dev to support a variety of different screen resolutions and sizes.

(And, of course, at the next Google I/O, I wouldn't be surprised if every attendee gets a Nexus 4 and a Nexus 10.)