I think this has two sides. And from what I'm seeing A LOT of people are way less productive when working from home.
That can be for a lot of reasons, but it actually is important to "divide" your personal and work life.
If you have multiple rooms in your house you can use one just to work and that is good. But if you're working in the same room you're planning on watching Netflix a few hours later it can actually be bad.
I am all for WFH, but I think it only increases productivity in people who treat their job a bit more seriously.
A lot of the 9-5 people that are counting the minutes to log-off are going to be a bit less productive.