> I view lines of code that other people have to maintain as less costly than lines of code I have to maintain. Initially... but they can break your lines of c

> I view lines of code that other people have to maintain as less costly than lines of code I have to maintain. Initially... but they can break your lines of code in unforseen ways in the future, and when that happens it will be you maintaining those external lines of code, because no one else cares. To make things worse external dependencies are often highly generalised and complex because they are trying to cater to more than your project, as a result you may incur the cost of those lines of code even if your project doesn't need them as you have to wade through them and accommodate them when things go wrong with the parts you care about. I'm talking worst case, but the point is, you want to only use dependencies you trust, which usually means minimizing your total number of dependencies also.