This is true. It required us to buy a new house with another room; versus more nice to have.
Lots of public accommodations are maximized for four people such as restaurant seating or hotel rooms.
Parents can no longer just split up with one kid.
There are lower cost options. We did have to buy a new car (replaced a Toyota 4Runner with a Ford F150 Crew Cab) - our other car was already a Honda Odyssey - but all three of our kids share a bedroom and I bought a lightweight Helinox cot that we use in hotel rooms when we can't find a place with 2x queen/king + sofa bed.
