There are two questions here, and I think it's important to look at them separately:
* How does systemic bias manifest in what is kept, and what is not, on Wikipedia?
* What is the best way for a student to engage with Wikipedia?
I'd like to address the second one, where I have more experience. It depends on what learning outcomes aiming for. If you're looking to give the student some practical experience with Wikipedia, in a general way -- which is what I've done -- I would strongly urge you to design your lessons in a way that guide students away from topics where notability is a substantial concern (grey areas) in their early edits. Put them in a context where they are more likely to have productive encounters, than difficult arguments.
If you're looking to have the students engage with Wikipedia's systemic bias, I think it might be more worthwhile to have them evaluate existing deletion debates (and similar discussions) -- rather than having them contribute directly to Wikipedia. I think it would be easier for them to look at a larger number of cases, and observe without having their personal attachment to an article come into play, if they read stuff that they haven't been involved in.
-Pete
[[User:Peteforsyth]]