I'm as frustrated as anyone about the 1px border. It makes blending difficult. I spend a lot of time trying to work with them, so I try to be considerate about not leaving them, and that has worked on hundreds and hundreds of grids.
What got me going is that SNZ was taking another cheap shot at me. My overall rate of leaving 1px is really low. It was a simple mistake that most people have made many times. But when someone else does it, I'm not all 'hey, be more careful' because I give them credit that they can figure that out on their own. If they might need some advice on how to avoid it, I'll send them a private email to avoid public disrespect.