I have automation in my 10.9. I never use it. This year I turned it on in canola just to see how my settings compared to what the automation would do. It increased the fan speed 50 rpm.No it wasn't. Automated crs are rare.
I guess it is apples to apples enough for us.
Automation won't drastically change a machines performance, it does fine tune it with parameters that you preselected so you still need to know how to set the machine fairly close.