I claim nothing, please see "Imo" above.

When you work by yourself: You never compromise. You dont need to spend time communicating with other members of the team. You dont have errors due to miscommunication. You dont have disagreements. Meetings to decide things happen in your head and take a few minutes instead of hours. You spend 0 time coordinating the team. Project/time management of the team becomes a triviality rather than a full-time managment job.