Ok. So this article comes by my normal google Reccos
TLDR south Korean companies did studies and found drops in productivity when WFH was implemented.
Fun fact! Seems the work ethic of South Koreans can be excessive so basically when WFH was done people likely went from unhealthy work habits to normal ones lol
https://www.theweek.co.uk/97569/gwarosa-why-koreans-are-working-themselves-to-death?amp
Also the study said perceived productivity…so no quantitative data.
But this study CONFIRM Elons email.