Just a random and wild thought: I wonder if the inconsistency in battery life might be related to variances in ambient noise levels in the test environment. Could it be Siri listening to stuff when it shouldn't be by way of a bug or something else?

I have a maxed out 15 TB MBPro and the battery seems just fine and in line with what I expect. I love it: keyboard, screen, build quality, performance. I have literally worked with every single previous generation of the Pro and this one feels the best. Happy customer here.