This is probably more of an argument against taking broadly-stated descriptive statements from studies and uncritically turning them into prescriptive statement

This is probably more of an argument against taking broadly-stated descriptive statements from studies and uncritically turning them into prescriptive statements. You and I both find that our brains are more engaged when writing by hand. For you that engagement is a distraction from the subject at hand; for me that engagement actually helps me focus on the subject at hand. Its interesting that our personal experiences line up with the study's findings, but neither of us should probably change our habits over it.