As with all things, it's a trade-off, and there is a balance somewhere in the middle. i.e. Don't do really dumb things like copy-pasting code everywhere, but a

As with all things, it's a trade-off, and there is a balance somewhere in the middle. i.e. Don't do really dumb things like copy-pasting code everywhere, but also don't feel that every line of code must be a masterpiece. There isn't one rule or paradigm for all situations; you just have to use your best judgment.