I think it's rather obvious that there can be no rules about what subjects are suitable for poetry and what subjects are not. The important thing isn't the subject but the metaphor that the subject is used to support in service of the poem's attitude or theme. From light to serious verse, the reader wants at least a momentary sense that something important is being said, even if (as in light verse) that sense ultimately dissipates and is illusory. So any raw materials will do, in theory, for the literal subject matter of a poem so long as the poet doesn't claim intrinsic interest based on those raw materials. The interest has to derive from the way the materials are manipulated.
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