why is it so important to see the device?

you only touch and play with the controller, the device is just a box

we clearly know what the PS4 is about

1- the hardware is PC-ish 2- the system will be dev friendly 3- the vita will be used to cover some of the use cases of the wii u, maybe more in the future 4- lots of focus switched to social aspect of gaming, like sharing and streaming

I do agree with few points 1- the graphics are not all that impressive 2- they really didnt show off the new controller potential

but still we now clearly know what PS4 is about