Douglas Crockford in his book JavaScript: The Good Parts:

"Features have a specification cost, a design cost, and a development cost. There is a testing cost and a reliability cost. The more features there are, the more likely one will develop problems or will interact badly with another. In software systems, there is a storage cost, which was becoming negligible, but in mobile applications is becoming significant again. There are ascending performance costs because Moore's Law doesnt' apply to batteries. Features have a documentation cost. Every feature adds pages to the manual, increasing training costs."