The Simplicity Principle from RFC 3439 says:

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Abstract

   This document extends RFC 1958 by outlining some of the philosophical
   guidelines to which architects and designers of Internet backbone
   networks should adhere.  We describe the Simplicity Principle, which
   states that complexity is the primary mechanism that impedes
   efficient scaling, and discuss its implications on the architecture,
   design and engineering issues found in large scale Internet
   backbones.
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Make your own opinion.