Comment by ludicrousdispla

Most native English speakers consider 'speaking plainly' to be a better indicator of knowledge and expertise than the alternative.

I can understand the sentiment though, as I am learning a second language and in many of our writing assignments we are expected to use (from my perspective) overly formal and complex grammatic structures when writing simple letters. I have come to accept, or at least hope, that this is simply an exercise to ensure that students have fluency with the grammar.