I think power-to-weight has different meaning to different people. I know one logger that uses as small a saw as he can get by with, because he hates lugging a heavy saw around...which is sorta silly because he uses a shear, just keeping a chainsaw around for "surgery". Granted, the little 242xp he likes is light and handy, but I watched him gnaw on a big burr oak for an awful long time once with it. At the time I owned a nice Jons 2077, which would have made quick work of it...
In the same situation, I'd rather have a bigger saw, capable of anything. Since a shear operator or other mechanized forester only starts a saw up now and then, why not have something around that "satisfies the need for speed"?
On the other hand, cleaning out a plantation, where you're knocking down every other 12" stem, and dragging a saw around all day, I'd be real happy with that 11 lb, 3 cu in saw.