I don't want to reitterate in all detail yet again but here is the run down.

Significant shorter battery life.

Lights up a dark room more than the TV itself.

Blinds people who accidentally point it at a close surface.

A lot of people won't care because their setup is different but people like me who play in small and completely dark rooms with close proximity to the TV do care.

Dimming is still better than nothing.

but the other thread says you can!

how long is the battery life of the ds4?

Dimming is good. It was too bright while playing Outlast in the dark.

According to owners, it reflects on TV.

Something like 5-7 hours according to one of my friends.

That's around the same time as the Wii U gamepad. Wtf

err...

Gamepad is like 3 hours.

Pro Controller is +80 hours tho. 

Yeah, about this. The light really drains it, it's so bright. It looks cool for the first week, but once the novelty factor wears off you realize that it's killing the controller.

Nintendo has that high capacity battery that promises go up to 8 hours now

http://www.gamespot.com/articles/wii-u-gamepad-high-capacity-battery-now-available-promises-8-hours-of-use/1100-6416842/

Not sure if the battery is now standard in new wii u's