I sometimes wish they would have named the color something other than "brown". Like Wild Bay - it seems easier for people to grasp that they are related genes and how the testing works if Bay would be in the name of the color. I never seem to have a problem explaining that wild bay is a variation of bay - everyone gets that, but for some reason those same people get lost when discussing brown.
I'm with you 100% on that sentiment. I wish it were called seal bay (and am often tempted to use that instead of brown in posts...) It has already been used for a long time to describe dark bay horses, many of which are likely 'At' in reality. Then you could have classic bay, seal bay, and wild bay- seems a lot clearer that they're closely related colors to me!
I think a lot of people who know just a little bit about genetics think that 'brown' is an uneducated term when they first hear it used to describe a horse (since so many horses have brown-ish colored coats) and don't realize it's based on a specific genetic marker.