I prefer 8x over 7x or10x. 7x isn't enough reach for me, and I can't hold 10x as steady. I like the DOF and bigger FOV in an 8x versus a 10x also. Also, an 8x56 has a lot of optical advantages over even a 10x56. It has a bigger EP, so it has less glare, less optical aberrations, you can see in the shadows deeper and in low light it will be brighter. Outside of the weight, a good 8x56 is the ultimate birding binocular. The two best are the Swarovski SLC 8x56 or Zeiss FL 8x56.
I think more birders would carry bigger aperture binoculars if they realized how much better they are. I am not recommending you carry a 56 mm binocular if you are hiking a lot, although with a harness it is tolerable. In that situation, I would use an 8x42 or 8x32, but you are giving up a lot when it comes to the view. For short hikes, in a hide, on a tripod or used statically, give me an SLC 8x56 or FL 8x56.
The SLC 8x56 is only 9 oz. heavier than an NL 8x42, and it is better and $1000 cheaper. All the optical wizardry in the world in the NL 8x42 can't defy the laws of physics. The SLC 8x56 still has a huge aperture advantage, and it makes it superior to the NL. Astronomers know that aperture rules, and birders should know it too.