I have used the tool during renovations to help people visualize my current floor plan when Im shopping for tile.
It definitely gives you the ballpark on the perimeter and the square footage that is useful for estimating the cost of both drywall and tile.
I can see this tool as a help tool for Real estate agents to create a simple blueprint for old houses and display them within the MLS.
Mumbling Mac about RoomScan Classic, v4.20