What a therapist actually sees in the first 10 minutes inside someone's home
In a clinic, an evaluation starts when the patient walks through the door and ends when they walk out. In a home, it starts in the driveway.
The approach
How many steps to the front door, and is there a rail on the correct side. Whether the walkway is even. Whether the porch light works, which tells you something about whether anyone is coming to help with small things. Whether the storm door is heavy enough to be a problem for someone with a walker.
The entry
What is by the door. A cane, unused, still with the price tag. A walker folded in a corner because it does not fit through the hallway. Shoes with worn heels. Mail piled up in a way that suggests it is being collected but not read.
The path they take
Watch which route they choose to the living room. People develop routes around their own house that avoid the thing they are afraid of, and those routes are more honest than any self-report. Ask them to take you to the kitchen instead and watch what changes.
The rooms they do not offer
Most people show you the front room. The bathroom and the basement stairs are where the actual risk lives, and those are the rooms you have to ask about. Frequently the answer explains the entire referral.
Why this cannot be simulated
A clinic can approximate a curb. It cannot approximate the specific sequence of a person's own morning, in their own light, in their own shoes, with their own furniture placed exactly where it has been for thirty years. That sequence is the treatment target. Everything else is a proxy for it.