You lose the ability to monitor by introspection: all you know is "this VM is using X CPU and X RAM", you can't look into what it's doing inside the VM. It's t

You lose the ability to monitor by introspection: all you know is "this VM is using X CPU and X RAM", you can't look into what it's doing inside the VM. It's the same as a VM without an agent, today. This can be considered a security win and a usability loss.