Duplication isn't just wrong because of code drift, it's also wrong because it's a certainty in a big app that someone else has solved that part of the problem better than you can or that they will improve the solution over time in their code base.

Excellent point.

Personally I don't understand the complaints about dependencies. Maybe this is because I am not, nor have I ever been, a sysadmin and have always been a programmer. From the point of view of a sysadmin, install time/issues are something that can really gum up your day, especially if you are installing on a more than one server. From my perspective as a programmer, the amount of time saved not having to write, test and maintain a piece of code is well worth the time it will take me to install it a handful of times.

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