Previously running a team remotely I found that the existing team did well, but training anyone new was difficult. The lack of interaction and discussions at lunch or the pub afterwards used to solve issues, that obviously stopped happening.
Some people slack off, some more than others, but the biggest issue with that is people that you couldn’t get hold of on a Monday morning or Friday afternoon if there was a problem.

To give a reason, I think it’s less productive but keeps people happier. A lot of the best employees want to be remote, and if you insist on the office you’ll never get access to these employees.