I'm not sure I quite share your view of what art aims to do. Iris Murdoch had a line that tyrants fear art because art forces them to confront the truth.
If one believes, as Murdoch suggests, that art aims to express a truth as clearly as possible then the qualities of good technical writing and good fiction are entirely compatible. I'd suggest the distinction lies more in the extent to which the sensibilities of the author are present in the writing.
If one believes, as Murdoch suggests, that art aims to express a truth as clearly as possible then the qualities of good technical writing and good fiction are entirely compatible. I'd suggest the distinction lies more in the extent to which the sensibilities of the author are present in the writing.
For instance, Vonnegut's guidelines on good writing (summarised here: https://www.brainpickings.org/2013/01/14/how-to-write-with-s...) could equally be applied to technical writing as fiction, I think.