As a counterpoint, there was a study done on call centre employees at Ctrip (big Chinese travel company) that showed a significant increase in productivity: https://www.todayonline.com/singapore/raise-productivity-let.... "Employees working from home completed 13.5 per cent more calls than staff in the office — meaning Ctrip got almost an extra workday a week out of them." So “normal office workers” can potentially benefit from WFH too, not just tech workers.