[retrac]

We were still taught that in high school in the late 90s. Probably some of the last. You are correct. Here's a good example of drafting from the 1960s: https://i.imgur.com/tXozAMy.png

It's not just all caps, but a flowing, easy-to-read style of all caps.

Hard to believe people used to draw all this stuff by hand. I was never very good at it.