It's axiomatic that people can work more efficiently when they have fewer interruptions and more power over their schedules. There are many studies on this. One by Gloria Mark et al. found that it took around 25 minutes for individuals to regain their focus after an interruption or context switch.
I don't have any evidence but neither do you. Then again I'm not the one that stated something was clear and undisputed when really it is just an opinion.
I'm not sure how increased productivity during the pandemic correlates to measuring the impacted of increased async communications vs meetings. I had a whole lot of meetings while working remote. They just occured via Teams, Zoom, Google Meeting, etc instead of in person.
It's axiomatic that people can work more efficiently when they have fewer interruptions and more power over their schedules. There are many studies on this. One by Gloria Mark et al. found that it took around 25 minutes for individuals to regain their focus after an interruption or context switch.
http://blog.idonethis.com/distractions-at-work