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It's not better...
Have a little read about line length
http://www.smashingmagazine.com/2014/09/balancing-line-length-font-size-responsive-web-design/
DaveH
Velocio
Why??
Because it's better, and I like more. For mobiles and tablets you give 100% of the space which is fine, for desktops you give an extra small surrounded by two rivers of dark grey.
Why don't let use the space available? But the real answer to your question is: why not?