"Language places heavy constraints on what can and cannot be expressed in poetry more than prose does."
If by this you mean "rhymes and meters", then perhaps. But, there is a whole world of interesting poetry unconstrained by such concerns. The form is significantly less constrained than prose - so much so that when prose does not conform to certain standards, readers often wonder if it is not too "poetic" to be considered prose.
In fact, poetic language is described as "the fullest possible language" where poets "pack the absolute maximum of meaning (in every sense of the word) into every part of the poem." This density of meaning and the ability to use language in unconventional ways actually expands the expressive possibilities in poetry beyond what is typically found in prose.
If by this you mean "rhymes and meters", then perhaps. But, there is a whole world of interesting poetry unconstrained by such concerns. The form is significantly less constrained than prose - so much so that when prose does not conform to certain standards, readers often wonder if it is not too "poetic" to be considered prose.
In fact, poetic language is described as "the fullest possible language" where poets "pack the absolute maximum of meaning (in every sense of the word) into every part of the poem." This density of meaning and the ability to use language in unconventional ways actually expands the expressive possibilities in poetry beyond what is typically found in prose.
https://pressbooks.bccampus.ca/engl1130/chapter/chapter-four...