Hardware feature table mentions WiFi, but not the LTE modem and radio which is far more important as LTE has to deal with skyscrapers and buildings with stone and steel which conveniently block LTE signals, population density, and spectrum consumption has been dramatically increasing year to year. The unit has the Qualcomm X12 modem but that modem doesn't cover AWS-3 (Band 66) which is a very large swath of spectrum, making the phone already obsolete for dense markets (e.g., large cities).

So, it would be very helpful to see 1) signal improvement, 2) download speed improvement, 3) improvement in voice quality when listening, 4) improvement on voice quality when speaking including background cancellation.

For example, something I rarely saw in iPhone 6s(+) reviews was the addition of a 4th microphone for noise cancellation. I also rarely saw any talk of the H.265 compression (2 x H.264) for FaceTime Video over cell networks in the 6s.

Last Sat, I was in a Starbucks speaking with a friend who was in a different Starbucks. I was on the 7+ he on the 5S. I could hear annoying background noise, he could hear no background noise. These things are critically important, but it seems as if the reviewers are not using these units in real world situations.

I think this is because the people doing the reviews don't really have technical backgrounds. Otherwise, they'd be testing this issues.

EDIT: The modem specs (for Verizon/Sprint). AT&T, T-mobile use a lesser Intel Modem. https://www.qualcomm.com/products/snapdragon/modems/x12