@irontoenail - I suspect too many teachers see students as a barrier to their profession rather than as accomplices who are just as capable of constructing their own learning journey as the teacher (with some help). I've had teachers try to make a project all about my interests and then impose all kinds of structural limitations on it and it sucks all the fun right out of it because it turns back into an exercise of ticking all the boxes, rather than learning for its own sake.
If you want your student to learn how to write an essay or do a statistical analysis, then teach that directly. Unschooling is supposed to be a journey that they get to entirely plan and produce by themselves (with whatever help they need).
In this day and age, the most vital lesson a person can learn is how to learn. Most information is freely available to everyone at the touch of a button, so there's no need to memorize facts. But learning how to find those facts in the first place is the trick.