Originally Posted by Gerry Hull

A few advantages:
I will not drop a chain one time this year.
Not once (and this may be credited to the toucan-bill shaped chainkeeper, which is truly is genius, for the success or failure of a top-notch 1x10 rests with the quality of the chainkeeper) will my peace be destroyed by the sound of chain-rub from crank or frame flex. And I have many sweet spots, friends.
During group rides I will gain 10 feet on you every single time you switch rings.
And ten more feet while you realize you are now in too high or too low a gear.
The sweetest advantage of all: elimination of unnecessary thought.

Question:
What 2 vehicles in the world have TWO transmissions?
Answer:
Over-the-road trucks, and modern bicycles.

That is really all that need be said on the topic of front derailleurs.