The only thing not premium in the build of the Note, was that horrible silver plastic band around the Note 3. Otherwise, the Note 4 has among the best build quality. I personally don't want a glass back on my phone; other than the screen, glass is a dumb phone material to me.
I do agree with the author that if they were to go all metal, just stop pretending it's not possible to do a removable back in aluminum. As it is, I love the back on my Note 4. It's got all the positives: looks great, feels good in the hand, allows for removable battery and SD, is easily interchangable for 3rd party replacements. (I'm never worried about it being scuffed up because it can be swapped out with a brand new one in an instant.)
I'd be more pissed at the idea of this if the GS6 wasn't such an awesome device, especially the edge model which IMO is the best looking/most interesting phone out right now. I hope they'll just consider an SD card slot on the side of the device. I could maybe live without the removable battery, but no SD on the Note line I think is a dumb idea. The whole point of the device for many is it's a productivity device, not a wanna-be iPhone. The last thing I want is an iPhone, as productivity devices, IMO, iPhones blow.