I don't disagree that everyone has their own idiolect, but I don't think that's generally the most relevant attribute of the way someone speaks at the given mom

I don't disagree that everyone has their own idiolect, but I don't think that's generally the most relevant attribute of the way someone speaks at the given moment. I think the group within which they are speaking has a much greater impact; i.e. the dialect I speak with my friends from high school is very different from the dialect I speak in a job interview for an academic software job. Sure, there are some words or structures I use more often that are unique to me, but the differences based on the context of my speech are way larger.