For
It improves mental health and productivity.
Against
It might reduce output and increase costs for businesses.
Anonymous excerpts, translated where noted.
“I currently work 4 days a week and I am happier, mentally healthier, and more productive during the days I work.”
“Nearly half (46%) also said working and productivity improved.”
“Small businesses that are unable to afford extra staff would disintegrate overnight.”
“His biggest concern is that cutting one day will mean scrambling the other four, or worse, missing key deadlines.”