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The true point of playing with full area it's not cause of the area itself but cause of the sensitivity.
Bigger area-slower sesitivity , that means you are mostly not going to make those short movements that could you make miss.
OBSVLY like someone said not anyone can play with a full area and can still do pretty well, the key to achieve this is trying to have a pen grip that allow you to move less the pen itselfs and more all the hand/wirst.
Two examples are Chewin and CXu, you can check their liveplays in youtube.
also , 666 posts.