In "Love Poem," the allusions to idiomatic expressions mainly serve to do the following:
A. Highlight the severity of the beloved's shortcomings.
In "Love Poem," the speaker talks to his beloved, but in an unusual way. Instead of complimenting that person in every single aspect, making them look perfect, the speaker tells us about their shortcomings.
That is what the idiomatic expressions "bulls in china" and "A wrench in clocks" serve to show. They emphasize that the beloved is an extremely clumsy person.
However, the speaker does compliment that person's emotional intelligence and capacity.
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