The "silly restrictions" referred to things like module length and using different classes for each day. Try as I might, I cannot see any valuable lesson being taught there. I am very well aware of the fact that a lesson to be taught may not be what would under other circumstances have been the optimal solution.
Pay attention: I am not critizing the teacher's choice of restrictions with respect to the problem at hand; I am questioning their worth as such. (Maybe I should have been clearer?)
I am in fact biased towards OO; I would tend to use it in projects that could be done without OO simply because solutions tend to stick around and grow, regardless of how short term they were planned, and I'd rather be working with organic growth in an OO approach than a procedural one.