Actually, i agree with him. All phones that have on screen buttons should have the screen offset to the bottom so that the useable screen relestate is centered.
Glad I'm not the only one. And really the way you are talking about would give more screen in the same casing. Talk about a win win.
The only problem with that is when the screen's off it'll be off-centred again. If someone's OC enough to be bothered by the on-screen buttons, then they'll equally be bothered by a screen that's offset on the bottom. It's either going to be one or the other.
For those who are bothered by this sort of thing their best bet is to go with a phone that has a symetrical design with the buttons on the bezel - the GS4 being the best example I can think of.
I don't know about you, but when I look at my phone I normally look at it with the screen on.... Meaning having the screen offset makes more sense. One of Motorola's leaked phones has something like this and it looks pretty good:
http://www.engadget.com/2013/03/13/unannounced-motorola-android-phone-not-x-phone/
Notice how the bottom bezel is shorter than the top bezel. Although it still doesn't fully account for it, it is better than the way the buttons are on the Nexus 4, and much better than this LG G2.
Also, my original point was not to offset the entire screen in relation to the physical casing. My original point was to just offset the keyboard
only in landscape orientation to compensate for the on screen buttons. In which case you can still have a physically symmetrical device when the screen is off. But again, I use my phone more with the screen on
Yes, the GS4 button layout is good for landscape typing. And I would get one if they made the home button capacitive and changed the menu button to a multitasking button like the Nexus 4.