In writing, there are many things one can do to make the text better. Some basic rules of thumb include avoiding repetitions, avoiding passive voice, breaking down long and complicated sentences, or letting the reader think for themselves.

Do such rules also apply to scientific texts, and if not, why?

I can think of a few reasons why they may not. For example, avoiding repetition may create confusion — it might not be immediately clear if the alternative term is just a synonym, or if it is different and in what way. Moreover, using more advanced devices (or, for that matter, sophisticated vocabulary) could be problematic even for native speakers.

Surely we need to make the text as accessible and clear as possible, but it would be great if it were also enjoyable to read. Where lies the right balance?