Why not meet disabled at home or school?

One thing that drives me nuts is all the appointments with professionals where the disabled person is expected to show up at the office of the therapist or other medical professional. Quite often there is also a long wait - usually with nothing appropriate to do.

How come so many professional that work with the disabled haven't realized that it is often a major task for a disabled person to travel?

And quite often, the disabled person has an escort - so two people's lives are being disrupted. And, when the escort is a parent, each appointment usually means a loss opportunity for family income as well.

How come the able bodied person isn't the person who does the traveling to meet the disabled person in their own environment?

If the meeting really is necessary, then surely it would also be useful for the therapist or other professional to see the real environment that the disabled person is dealing with?

For example, wouldn't it be useful for a physiotherapist to see the layout of a home or school and be able to make better informed recommendations for equipment?

Wouldn't it be better for a school to provide a room for speech therapists to come into the school and assist students who need help on site? Then teachers could get first hand feedback on how to help too.