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So why is this a design issue? Because the slow addition of these little inappropriate fixes is like the growth of barnacles on a boat's hull: eventually you are not sailing a boat but sailing a rock. The initial stable design is made with great clarity as to the roles involved, but the junior programmer may not be aware of how important this issue can be: they don't see themselves as designers, and they may try to shoehorn all enhancements into the running system without considering the accumulated impact on the system's design.

Rick Jeliffe,
http://broadcast.oreilly.com/2009/08/a-design-trap-of-the-maintenan.html

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