Why Bottom Navigation is so Important?
Steven Hoober in his research of mobile devices usage, found that 49% of people rely on a one thumb to get things done on their phones. In figure below, the diagram that appears on the mobile phones’ screens are approximate reach charts, in which the colors indicate what areas a user can reach with the thumb to interact with the screen. Green indicates the area a user can reach easily; yellow, an area that requires a stretch; and red, an area that requires users to shift the way in which they’re holding a device.
It’s important to place top-level and frequently-used actions at the bottom of the screen, because they are comfortably reached with one-thumb interactions.