I agree, best to be introduced in the classroom.
What’s changed now is weather routing software which displays the upper air charts updated twice daily is more widely used… The upper air charts can also be downloaded by email if there’s no internet access.
If there is internet access the upper air charts can be downloaded plus self-teaching is a bit easier with maternal from the internet such as this article from Starpath.
I carry Heavy Weather Avoidance and Route Design: Concepts and Applications of 500 Mb Charts on my kindle.