Of course you should write simply. But of course, the context matters. For example, when writing mathematical texts, somehow being able to convey pure ideas is

Of course you should write simply. But of course, the context matters. For example, when writing mathematical texts, somehow being able to convey pure ideas is the ideal. Poetry is not needed in that context, it is confusing, as the beauty is in the ideas conveyed, not in the words used to convey it. In such a context, for example using the expression "vector space" counts as writing simply, while in a general context it does not.