Agreed. Knowing how much space is needed.
Also, people needing to know when to downsize OR not overbuy for what they actually need, or can maintain.
My dad's got an older house. Small place ... but large rectangular lot. Shitload of steps from the front street to front deck, and another 20 - 25 at the back to get up to the alley. It all adds up ... the extra wear and tear on knees, hips, and back.
Many of us have encouraged him to move to a smaller place, and he's not chosen to, but did admit to me a year or two back - "Yeah, I fucked up. I probably should have moved about 10 years ago." - arthritis in knee ... a challenge to maintain the trees and shrubs / ivy, etc.
Whereas by contrast ... my mom has lived in smaller places & in apt / condo. She has moved around alot but is common law now with her boyfriend and they have a small manageable place. Flat ... with a few steps out front & out back. My dad's got about 70 stairs to get to the front door at 75yo.