My wife is a grad student. Every time she writes a paper, no matter how long, she prints it out and then marks it up with a red pen to go over changes she thin

My wife is a grad student. Every time she writes a paper, no matter how long, she prints it out and then marks it up with a red pen to go over changes she thinks it needs. I always think this is extremely backwards and she should just edit it directly in word, but it is what works for her. She will surely do the exact same thing with the book she is working on as well.