Prevents collaboration with others, ability to rollback to a specific release to test a bug, partially developing multiple ideas. All of that is possible manua

Prevents collaboration with others, ability to rollback to a specific release to test a bug, partially developing multiple ideas. All of that is possible manually, but it is doing version control by hand. There are plenty of great tools out there to simplify that process. And if you start automating your manual custom process, you just end up at your own version control system that is something additional you have to mantain.