You understand that your point is flawed? Compromise isn't always necessary! The OP was looking for innovation in this space, similar to say what Tesla did for autos.
-.- but it is. You can't make thinner devices with more battery. The way battery tech is right now is that to make it thinner you need to sacrifice battery volume and consequently capacity. Nothing short of a major technological breakthrough will change this, and nobody on earth has shown even the slightest signs of having managed to produce a better battery technology, let alone it being ready for consumer tech. So no, my point is not in the least bit flawed.