Yes they use some plastic, but also metal, leather , wood as well. The sensor hub is the same thing Motorola did in 2013, because there was nothing available at the time that could do that, so they did a custom chip. With the advent of the SD 800 series chips, there was no need for a separate chip since they have that built in. It's literally pointless to have a dedicated co processor chip when the same thing is already available in the SOC you're already using. As far as the camera, the chipset isn't the issue, it's the size and quality of the sensor that has the most bearing on quality in terms of hardware, and post processing software in the non hardware aspect that make a good camera. The display is also a different tech than what they have been using. I have a Droid Turbo currently, which has an AMOLED screen with similar performance to the Nexus 6, and neither are great. Sure it's detail is there, but the brightness is about half of what most of the competition gets and about a third of what the X Pure gets. Even with it cranked up all the way, it's barely usable in sunlight. Yes the fingerprint scanner is a plus, but I wouldn't say the same about the 810 until we see it's performance and if heat will be an issue, which is the reason Motorola went with the 808 in the Pure.