this is why there are a bunch of other companies selling you devices that can play stuff at slightly higher resolutions for lower amounts of time while valve is doing the opposite.
handhelds is a balancing act to try cater to people
you either get 1080p 60fps and crap battery (unless you want to go the 1600p legion go route) or you get 800p/720p 40-90fps and decent battery if you are smart