What are the 3 things to streamline?

Lock thumb
Look down
Squeeze ears

 
What common problems do these commands/goals/specific words correct:
 

Head lifted and looking forward
Arms not tight against head
Hands wavering
Body not straight
Hands at 11
Arms bent and slow
The "fake" streamline
Short streamlines
The bad crawl position

 
By doing all 3 things, it addresses almost every single bad habit in streamlines.
 
Why do we do it at all? Why do we do it with beginners?
 
Streamline is the most efficient and best way to move through the water. Every stroke moves from streamline into movement. It is the easiest horizontal motion we can do. It is the starting point. The base.
 
With beginners we are less strict with the 3 goals, and they can do it on the surface. We still enforce the looking down. We encourage the squeezed ears, and the locked thumb..
 
As we progress through levels we initiate the

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