Although we've had gains from Q4 2019 to Q4 2021, I am not sure they are significantly higher than baseline in other periods. I would be skeptical of a productivity increase due to WFH simply because of the supply crunch that in many ways hindered the ability of people to output at maximum levels.
Maybe if we are talking some specific sectors.
True, it depends on sectors but that is always the case with productivity, it never improves across the board, any automation or other changes will positively affect some sectors and negatively others. It's the macro net effect I think that could change things. I just think there has been some real fundamental changes due to the lock down that may have a lasting impact and make it difficult to use past patterns to make predictions.