Earlier quoted context omitted.
Then why have it lock at all? You must never have access to critical things like a bank account, source code, internal documentation of business ongoings. So basically if you have no sensitive information, by all means!
Sure I have. And so did everyone else in my group. If you can't trust the people who you work with... In the middle of the day someone will notice someone else using your computer. If no one does then the camera overhead will.
It's all a series of defenses, the last one you should ever rely on is piecing together what happened by video camera... what happens when they install a root user, or ssh authorized key on your system and then do whatever they want at some other time?