Two recent questions from one user
- What are some interesting calculus of variation problems?
- What are some interesting coupled harmonic oscillators problems?
From my point of view these are "make a list", so should certainly be Community Wiki, but moreover they don't seem to contribute very much.
They don't seem to fit any of the explicitly allowed categories, nor are they "practical, answerable questions based on actual problems". Instead the run to open-ended, collecting a book's worth of examples with no unifying theme, and they are a reasonable if inexact match for the "every answer is equally valid" category of bad questions.
Further, the generic formulation suggests that there will be no end to them and even if there are a few interesting ones, most will be pointless.
Comments on their on-topicness and or Community Wiki?