I agree the camera is not great. No Android so far was able to compare against my former S7 Edge (I guess S8/Plus and Note 8 are better though). And that's not okay. I have to admit though, the Mi 6 is a filler device for me until the iPhone X comes out.

The LTE band support problem is weird and I guess it comes from Xiaomi not pulling the right strings in the USA. We can only speculate though.