I'll be carrying my charger with me. These numbers are great on paper, and sure they can reflect the overall trend of higher battery life, but are not examples of real world results.
I wouldn't be surprised if these results are on airplane mode with the brightness locked to the lowest setting and the volume off with no Bluetooth accessories. The title says "video streaming battery life" however the website actually says "video playback."
If I'm navigating with Apple Maps, which is using GPS (and other sensors depending on your transportation mode), along with a higher screen brightness so I can see in the daylight, I'm not going to get anywhere near 28 hours. And I wouldn't call that a _very_ "heavy" use case.