Which is why the entire track a student follows through school is important. They should never be taught, then abandoned when their education is only a few years along. The teaching should change as the student grows and becomes more sophisticated.However, I still think that it's better to teach kids the right thing than to teach them the wrong thing and hope they'll unlearn it and get it right in high school.
I think learning to get your story across without all the -ly tags and excessive ad-verbiage is tremendous. Once you can do that, you can skillfully add them like spice in pinches to flavour your story instead of dumping the entire box of black pepper into your soup and ending up with an unpalatable mess.