Your average smartphone chin is about 15mm, with the exception that the S8 chin is 8mm, the G6 is 9mm, and the Pixel is like 4 feet.
A 6.7mm chin is welcome to stay forever! Although with the virtual navigation bar taking the place of the physical buttons, it's safe to say that the bottom bezel really isnt being reduced, but at least now, we have the option to hide the nav bar when gaming, thus giving us a much greater landscape. My ideal bezel thickness would be less than 4mm top and bottom, or an even 2mm border all around (like those iPhone renders, minus the top camera/speaker cutout). I'm just happy that my bezel-less dreams are finally becoming a reality.. This has been something I've wanted for what.. Almost 10 years now!!