Earlier quoted context omitted.
Totally agree. I bought a Galaxy S3 recently and my only major regret is that the thing is freakin' huge. I don't understand at all why this is desirable. Even in the rare instance where I want to watch a video on my phone, the slightly large screen doesn't really noticeably improve the experience.
The killer use case for large screens: make sure you're using Google Chrome as your browser. Then select "request desktop site".
We could use robotic pixels, to flip around when you need them on the edges (it would also mean you could embed a camera in the middle of a screen for better eye-communication)