>why doesn't any SUV come standard with built in car seats in the back for infants and children
Not every SUV buyer has children at car seat age. Those children will outgrow the need for car seats, at which point the built in car seats are wasting space that could be a regular seat.
Not every SUV buyer has children at car seat age. Those children will outgrow the need for car seats, at which point the built in car seats are wasting space that could be a regular seat.