Is now much better in the hand

I wonder for a long time and now that the S4 has been released:
Why are smartphones ever thinner and lighter ???
I'm just not so clear that I take a 600 smartphone in the hand and it feels like I have a stack of postcards in hand.
Anyway, I believe that I am physically able to keep a long time a smartphone with more than 130g weight in your hand. Only out my opinion on it!
At least Samsung has brought a bigger battery on the market, which provides for a reasonable finally feel of S3.
With about 11.5 mm thick and about 155 g Weight incl. 32GB SDCard and Micro SIM it feels to finally as it should be.
At runtime, I need not say much. The course is much longer than the standard battery.
For all bodybuilders and strength athletes, who can lift the 155g, clearly recommended.