Interesting as my ‘22 BW5 does not, but I prefer it that way. For me, I would never haul 3 passengers in the rear anyway and I have only one adult kiddo. I have multiple other cars to choose from if hauling extras is necessary. But the center rear belt does works for my driving critic with short legs
IMO, looking at the rear seat stitching on the other two seating areas, plus no center head rest and the drive shaft tunnel for the floor, to me it doesn’t really look like a seating area aesthetically. But, I also understand that for others with larger families, this may be their only vehicle and they may not have a choice and for some that have to have the extra red.