Why is screen HEIGHT not taken into consideration while designing responsive layouts for mobile apps?

While creating responsive layouts for mobile apps, we take into account WIDTH of screen, and create layouts for different WIDTHS, but why don't we consider HEIGHT?

If 2 devices have a lot of difference in HEIGHT, my app in one device will look drastically different from the one in other device. Doesn't responsive layout mean that my app should look the same in devices of all widths and heights?