"it's just as true that the tasks Flash is used to do are intrinsically complex and power consuming"
Spinning, blinking, scaled moving sprite advertisements. I don't think those are intrinsically power consuming; the GPU on most phones/laptops could handle them (blind guess) 50x more power-efficiently than flash.
Spinning, blinking, scaled moving sprite advertisements. I don't think those are intrinsically power consuming; the GPU on most phones/laptops could handle them (blind guess) 50x more power-efficiently than flash.