I’m in a company where English is not our native language, yet we write almost everything in it. Being a second language I sometimes need to phrase and rephrase my ideas while writing them. I found that it sharpens my thinking.
In my experience, the exercise of fine tuning what you are and aren’t saying is one of the main reasons to write it in the first place, because it’s actually helping you figure out what you are and aren’t thinking too.