Certainly, the poet should deviate from a consistent pattern, or avoid patterns completely, only if they know what they’re doing. But using the term “allowed”, in discussion of poetry (or any art) is wrong wrong wrong.
In the spirit of charity, I normally unpack “X is not allowed” in these sorts of discussions to mean “X is very unlikely to achieve our shared goals.”
The question of what, if anything, can profitably be assumed as shared goals in art is admittedly a trickier question.
Certainly, the poet should deviate from a consistent pattern, or avoid patterns completely, only if they know what they’re doing. But using the term “allowed”, in discussion of poetry (or any art) is wrong wrong wrong.
In the spirit of charity, I normally unpack “X is not allowed” in these sorts of discussions to mean “X is very unlikely to achieve our shared goals.”
The question of what, if anything, can profitably be assumed as shared goals in art is admittedly a trickier question.