What's interesting about that Workforce article is that the tone is completely different from the sources it cites. The "2 days less per year" article by Namely that they cite is about how to effectively implement an unlimited PTO policy that doesn't have that side-effect. In the Fast Company article they cite, they found this:

> In a survey we conducted just before we hit the one-year mark, our employees ranked unlimited vacation third-highest among the benefits we offer, just behind health insurance and a 401(k). It beat out vision insurance, dental insurance, and even professional development, all of which ranked highly in their own rights.

Their Unlimited PTO policy didn't move the needle at all on how much vacation people took, but it had a huge impact on how people felt about it. In short, they appreciated being treated like adults.

How the author of that Workforce article got from the two sources they cite to the extremely negative article they wrote is beyond me.