Just as commercial courses went the way of the dodo, so
did things like mechanical drawing, which became software drawing.
While here too the functionality remained, the methods for doing it
changed so radically that people in the fields had to later learn new
ways of performing the same tasks.
Today many machines are controlled by computers, and the draftsman's and engineer's job is to program the computer. So much of the skill and neatness reqired to be a good draftsman in the past is now a meatter of writing a neat computer program, and learning the software that enables one to do it.