The typical CS paper is written by a grad student who speaks English as a foreign language. They can't express their ideas as well in English as their native la

The typical CS paper is written by a grad student who speaks English as a foreign language. They can't express their ideas as well in English as their native language, and they probably don't have that much experience in writing in any language. When they write, they often end up copying phrases and sentence structures from other research papers. Most papers about new results are published in early stages of research. The authors barely understand the results enough to be convinced that they are correct. They can't explain the results well, because they don't understand them yet. If they continue working on the same topic, they will probably come up with a good explanation after a few years and two or three complete rewrites.