Good question! The answer is: not necessarily. Technical writers write ‘simplified English’: limited vocabulary, short sentences, consistent terminology… Not because we cannot do better, but because we write with the restrictions of the reader in mind. The language we write must be free of spelling errors and grammatical errors – no doubt about that – but it need not be the language of a novel writer. On the contrary: native speakers are likely to use words and idioms that non-native readers do not understand!