When you are learning how to write as a small child, it's a big deal to write clearly (for obvious reason). Then you are forced to learn cursive, and its a big deal to write cursive clearly.
Then it doesn't matter anymore. Literally everyone stops caring as long as it is legible. It's a weird system. While you are learning to read and write, there is an emphasis on penmanship. But once you are literate...no one cares anymore. Most people (like myself) degenerate back to chicken scratch. Especially as typing became more prevalent. I would hazard a guess that children in the States have even worse handwriting nowadays.