I got to thinking about routers.....
In the "old" days, you'd use a pantograph....
But manual or CNC, one aspect that throws the perspective is that a CNC spindle and axis control eats power....but pumps out the product!
A manual machine, on the other hand, may use less power, BUT, you have to run it a lot longer for the same toolpath.
... And my coffee consumption tripled when I started running CNC.... so you have to factor in the pot wattage, extra trips to the store for beans...