Agree, Sony Z only first impression good, then no more already.

Too bad S4 not even give me any impression at all. Haizz...

Well, it wouldn't qualify as an arguement as there is no arguement point to begin with.

Your justification is therefore invalid.

Which? Jpeg/gif or the game? Lol

Right now most game developer doesn't talk about HD 1080p but more towards creating new era gaming world based on s4 feature "eye tracking systems".

They are very keen to utilise it as next game controler and also can work closely with samsung dev. on it. Imagine game like shootings game can aiming targets using our eyes before we pull the trigger.. when think on it, awesome...

For people without arms, this kind of technology will become useful for them

hd games for mobile have long existed, so no sweat. For eye obviously using the front camera, then they calibrate your eye movement to the controls and walla. but then i doubt it will be a very solid way of movement/aiming and you cant not move your head at all...so there must be other ways that devs are interested in utlizing this.
another thing are the new sensors, many new interactive apps can be made with new sensors, in the future i foresee motion sensors being in mobiles and we would be playing games like the Wii and Kinect

I'm also afraid my future aluminum HTC One will suffer the same fate. If dropped and got dent..how..?
Both glass and aluminum will be dangg expensive to change. If it possible to change.
That's why the proven light thin bendable plastic rules..!!

This will bring you back to the first question.
Why do you cares that S4 is using cheap plastic IF you gonna slap casing over it..? 

And you going to do the same even if you buy Xperia Z or HTC One. So..what i've said is correct. Whether it's glass..aluminum or plastic..doesn't matter at all IF you going to put casing over it.