General Science that is not general
A General Sciences course can seem like a random collection of "science topics that somebody thinks you should know." What we want is a course that is a general introduction to the measurable universe, because that is the topic of the sciences. This could be done in terms of pattern, or possibly in terms of history, but the history of science is not clear until you know some science.
Magnitudes provide a way of introducing all the disciplines in relation to each other. It's like having a history timeline. Once you see how it works, how could you not use it