It makes logical sense to have a separate discussion for each exercise. The downside is that there will be a lot more discussions, which could make it harder to navigate to the main discussions - especially the lectures.
We could control this using categories. All these discussions are already in the category Applied Category Theory Course.
If you haven't already tried it, I suggest clicking on this category (one of the first categories, on the panel to the left). That immediately filters out, for example, the introductions, which are in category chat.
My suggestion is to make another category Applied Category Theory Exercises, for the exercises.
What do people think of this?