In Why is the Finder app always open?, it was noted that you could add a Quit menu item to the Finder via a Terminal command, but the comments and one of the answers seemed to indicate that this was a bad idea and should be avoided unless you had a could reason. Why is this this? Does this prevent the system from working correctly?
I myself have enabled the Quit menu item in the Finder (via TinkerTool, rather than the command line) and find it useful for presentations where I don't want to show everybody my messy desktop or any open windows. I've also quit when I thought that I could use the extra RAM (like heavy Photoshop editing), although to be honest I don't know if that's effective. Are there any negative consequences that could result if I kept doing this?