Honestly, at that point you're just nitpicking, if it's important to know then it's important to know regardless. Why are you so anti people being taught how to function in the world? It's way harder to figure it all out by yourself even if it is possible.
I send my kids to Cheder/Yeshiva/Girls School so they should come out with a perspective of אלקות בפשיטות ועולמות בהתחדשות.
The
technical skills required to "function in the world" really don't warrant the potential time put into them in a school curriculum. They are either self acquired or should be taught on an as needed, when needed basis.
If you were talking about other, non-technical, skills such as public speaking (for example), some of those definitely do warrant dedicating education time, as long as they're done right.