I would say it because I've spent time on crutches, I have a parent in a wheelchair and another one that just wouldn't have the energy for a staircase much of the time, and staircases are a pain in the neck with small children and make it harder to move appliances and large items of furniture in and out. As a default form of housing, living across four floors is actively excluding many people with disabilities and massively reduces the ability of aging seniors to manage unassisted living.