The front middle seat was dropped because there is a display there and they could not figure out airbags with the display for the center passenger.
I have owned a six seat full size truck for a decade. I have had five in it multiple times but never filled the sixth front center position. Maybe a young small person would not impinge too much on the driver but it’s just not a high priority.
I'd rather have the extra seat than a display. I'm sure they could have found a place to put it or a tablet or a smaller screen somewhere else - maybe even make it detachable so people can move it around or put it where they want. Maybe having one on the roof that can fold up/down when needed like a sun-visor. If nobody is in the back it's useless and is in a bit of an awkward position. Could have even just used an app on each persons phone as that's what most people are glued to anyway. For most 6 seats probably isn't needed but it's ideal for families with three kids and/or a pet etc. I have seen a couple of people complaining that they needed the extra seat so it will effect those people for sure. I think they should consider having a six seat option in the future.