Time is not a measure of productivity
Not so long ago, most people were working at an office desk, and were expected to show their face every single weekday. Arrive at a certain time, take a lunch break, and stay late enough that people know you are working hard.
Using principles from hourly work to define productivity in knowledge work has resulted in highly inefficient—and sometimes unhappy—work conditions for many employees.
As remote work is becoming increasingly common, management will need to adapt. Abandoning time as a measure of productivity will not necessarily result in less hard work. However, it will result in more impactful work and happier work conditions.