Yes it certainly is, in fact it could be argued that it's too broad.
In Europe wooden structures and balloons/dirigibles are separate licence endorsements, that you study for and are examined on, if and when you choose to do them.
Why waste time and energy training people up in fields that very few will ever work in?
However you still haven't answered my question from my previous post.
How does a knowledge of, and an ability to work with both metric and Imperial measuring systems make people "a danger" as you put it?