Also there is a communication synchronization issue. If people have overlapping patchy schedules where people are not available for questions, talks or whatever, it slows the company down. By having a consistent core hours where everyone is working then you solve this issue.
Also if your still fucking around and not working super productively, your still available to answer questions quickly, meetings and other low energy tasks. While if you're not working and doing stuff at home, it's significantly harder to talk to you.
If you need that much sync in communication, either your methods of communication are wanting, or you have employees who can't figure out what they should be doing without having their hands held through every detail.
Nearly all necessary communication should easily take place in project/issue trackers and documentation. Developers should be able to operate without the constant need to bother others with questions - or being expected to drop everything and communicate with someone every time they are prodded without good reason. Office-dwelling employees need to train their discipline to work independently, and management needs to expect employees to learn that discipline.
If I have a burning question that absolutely needs a teammates' input, I can wait up to 24 hours for a response. If I can't independently work out an issue without assistance, and I also can't put that task on hold for a day to work on something else, I am failing at my job.
Managers should also operate under the assumption that every unnecessary meeting is detrimental to their business. Each block of 15 minutes spent in a meeting should be calculated as a loss of 2 man hours of productivity per attendee. Most meetings can be replaced by a single email or post in Slack or similar; so use those avenues instead. A meeting should only be considered as a last resort. The world would be a better place if everyone stopped and thought "Do I really need this meeting?" before clicking "Send".
Also if your still fucking around and not working super productively, your still available to answer questions quickly, meetings and other low energy tasks. While if you're not working and doing stuff at home, it's significantly harder to talk to you.