That is certainly a possibility but I have doubts. If you could gain 20+ % percent of productivity be making your employees work 20 % less, it would be stupid f

That is certainly a possibility but I have doubts. If you could gain 20+ % percent of productivity be making your employees work 20 % less, it would be stupid for any company to not do this. What seems more likely to me is that you can gain a few percent which would make the overall impact less than the full 20 %. Making processes better and so on seems mostly unrelated to me, that you could also do with a full work week.