Yeah, yeah, rub it in.

There is validity to the lower blade count arguements though.

The same thing is seen in other areas, such as boaters finding that a 3 bladed racing prop is better than a 4 bladed, etc.

In all cases the lower blade count results in higher speeds or better acceleration, something which is echoed on RC planes...

So "efficiency" as such is not such a misused sound byte.