[zelphirkalt]

Dependencies being future liabilities is one reason why core programming skills are so important. A team with weak core programming skills will quickly make a mess of dependencies, because they will not dare to implement that left pad or that tree recursion themselves. The mess will work, but the cost will be inflicted for as long as the dependencies are in there.

Of course there are some things which getting into is not so recommended, because of high initial time cost. Like writing your own web framework. Or correctly implementing data structures or difficult to understand mathematical algorithms, or cryptography stuff.