Perfection Before Progression?

When I started cheering, at least once I moved to the summer camp instructor and coaching side, “Perfection before progression” was a phrase I consistently heard. Although I heard it I don’t remember seeing it consistently on the competition floor.

Fast forward about 20 years and I still hear coaches preaching it. I also feel like I see more teams exhibiting it, but most of the teams actually practicing it had a negative reputation and are called “Sandbaggers”. How did we get from adamantly preaching something to criticizing those doing what was preached?