I'm not discounting your experience, but rather that each OS impacts people differently. You have completely different settings / apps, so our experiences will be different. With your setup, you are experiencing lower battery life. With mine, I'm seeing the same or better. Even though we have different results, we can both be correct.
Setting your phone as new reduces the possibility of software corruption, but does not guarantee better results. For example, if you're a Facebook user and the Facebook app is causing abnormal drain on iOS 10, it is irrelevant whether you set up as new, as you'll see lower battery life regardless.
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No test will take everything into consideration, as it's impossible to account for all of the variables. If anything it tests the amount of battery your phone will endure if you use your phone for heavy tasks like gaming or encoding.