I get where Rachel is coming from here. I think a decade ago when I had a separate phone for work was my least stressful time working... Unfortunately (in this case) I work for a University which I also attended school as a benefit, so the work/personal line got blurred for 6-7 years. Even though I finished my masters degree, it's become familiar to have "work" on my personal device now, when I used to be like Rachel -- separate work phone for the first 7-8 years I was working.
I'm happy she wrote this article, it's encouraging me to consider a low cost provider like Google Fi with an old phone and going back to the work/personal separation.