The difference is this:

If I hire 15 people, I can produce 20 widgets

If I hire 15 people + 5 lower-skill workers, I can produce 30 widgets.

The problem we face is visibility. The question becomes how is it that low-skilled workers can create more efficiency, they themselves don't do anything. The reality is that high-skilled workers are now free to get creative vs having to do the annoying tasks the low skilled workers just took off their shoulders. So _indirectly_ the low-skilled workers produced 10 widgets, but really, everyone was just working at a good production level.

People being less busy lets them be creative.

Oh, there are many reasons we have large organizations, and one of them is that you simply cannot do some things with a small team. I think you have to bend the definition of efficiency to it's breaking point to argue that producing 15 widgets with 10 people is more efficient than producing 10 widgets with 5 people though.

A Honda Fit is clearly a more fuel efficient car than an F1 racer. This remains true whether or not the problem you are solving is "win an F1 race," which would necessitate using the latter.

Actually an F1 car is extremely fuel efficient. In absolute terms it consumes more gas but considering the generated power they are probably one of the most efficient engines around.