Coordinate confusion

According to the documentation coordinates in Unity grow from bottom left to upper right. So why is it that a rect (left:601.00, top:646.00, width:266.00, height:162.00) does not contain a point (726.0, 567.8)

When I checked yMin/yMax I got the following: 646/808

It seems that Rect is calculating bounds by adding height to top, but top should be yMax and bottom should be top - height. Why is Rect implemented this way?

Ahhh! OnGUI coordinates start in the upper left of the screen!
I guess the idea is that you design menus from top to bottom… Still drives me crazy!