This is interesting because it does not jibe at all with the people I know and how productive they are. The friends I know working big tech hybrid jobs work maybe 25 hours in a good week, whereas the friends I know in office 4/5 days a week are easily at double that. I'd imagine there are some confounding variables here. I wonder if a lot of those hybrid companies driving high revenue growth are just profit machines…
This obviously depends on what the work is. People whose job is to focus on building things for hours at a time have very different optimal work environment from people who meet with and coordinate other people in short bursts. So no one-size-fits-all top-down policy can be effective; local flexibility is required.