It depends on what you mean by "failure". Kids need to be confronted with honest evaluations and positive feedback loops about their progress, including things

It depends on what you mean by "failure". Kids need to be confronted with honest evaluations and positive feedback loops about their progress, including things they need to work harder on or redo, in order to reach the expected levels of common baseline education. In the USA, there's just a general pushing through of all kids to the next step regardless of whether or not they actually learned anything, which is simply broken, too. It's missing any notion of failure. However, what we shouldn't do is effectively discard failing kids from ever succeeding, dumping them to the wayside. They just need different types of help than was offered by the bulk instruction, either in content or style.