I can see it too. A person buys a cape COD or place with a finished attic or whatever. The appraiser stated it has a GLA of "X" because the appraiser said screw ANSI, or didn't know about it, or didn't understand it. Then that buyer does a re-fi 6 months later and the new appraiser does it the correct way, the house has a smaller GLA, and the owner thinks they may have had their home overvalued. Then they call their agent, and an attorney etc...I cannot see abandoning the ANSI standard just b/c you don't like standards. I just truly wish MLS systems and realtors also had to follow the same standard. Everyone should be on the same page.