Thin & flat isn't better
"Huawei has managed to chop the thickness down from 10.1 to 7.3 mm, making it much easier to manipulate."
The Nexus 6 (like other Motorola phones) has a curved back, while it might be 10.1 mm thick in the centre it's much thinner at the edges, the result is a device that's much more comfortable to hold than a thin flat phone.