they dont change the front valve cover grommets.

They don't change the rear valve cover gasket/grommets.

Both leak oil onto the manifolds after a while.

Best to just do it yourself.

They also dont check the o-rings on the fuel rail quick disconnects.

If you move that around and it leaks, you need to replace the o ring or the entire connector.

And if you own a GT they only change the spark plug retainers.

which doesnt do anything about your leaky valve cover gaskets or fuel rail disconnects.