Researchers working in the sciences particularly appreciate the value of clear, well-structured writing. And you will also know what a struggle it is to achieve it. It isn’t at all easy to create an article that flows, where each paragraph leads naturally on to the next, and each section contributes to a convincing argument.
Hidden assumptions and gaps in your reasoning will make it difficult for reviewers to follow your argument. Unexplained and inconsistent use of technical terms will confuse them. Poor spelling and punctuation will annoy them. A good editor can help.