On the contrary, it's an efficient way of writing because it doesn't require you to spend time constantly lifting the pen off the paper. And the letters don't look significantly different from printed letters—they basically just have tails added to join them together.
But who writes by hand anymore? Really other than grocery lists. And they look different enough that it has to be learned how they relate to the printed letters one will see in 99% of the text one reads in life. It’s an old form made for dealing with a specific style of technology (quills) that’s post dated. If anybody wants to learn it on their own great, but as for spending taxpayer money teaching it to kids there’s many more useful things to have in the curriculum.