They are part of the package for a professional writer, but actually knowing how to write in the language you get paid to write in also helps. You're a competent ESL writer, but you cannot write up to native academic standards, period.
You are 100% correct. However, writing professionally in the English language requires intelligence, cultural familiarity, excellent spelling/grammar/punctuation/word use/structure, and basic sanity, all of which you—and those like you—lack.
You two have provided evidence for the fact that you are marked by lack of intellectual acuity. Could you please shed light on the people you mostly write for? You imbeciles have no idea of the people academic writers write for. The students themselves are not experts at writing, which is why they need professional writers for their assignments. Good English with good grammar, spelling and punctuation is expected or considered obligatory. If you write their academic papers in English language using much convoluted sentences, they may require great effort to comprehend what you have written, in case they try to make changes in the written paper to make it in accordance with their style of writing before handing it in. It's regarded as a complete loss of money for such students. Even if they hand in it without editing, they may be suspected by their tutors who can judge the capabilities of the students.
I have read the useless essay written by pitiable pheeLeaks for hapless biscuit, which was really pathetic as it did not meet the client's requirements. In business, customers' preferences are given top consideration. Moreover, a product is declared as of good quality, which meets customers' requirements and demands.
First and foremost, a writer should fully understand the requirements and he/she should have extensive knowledge of the topic he/she is going to write on. Secondly, the writer should possess excellent research skills, and keep in mind the reliability and relevance of the information sources to be used. I agree to the argument that a writer should clearly tell the clients about his/her identity and abilities. If the student himself/herself is a non-native speaker, he/she plainly has no problem with the quality provided by a competent non-native writer.