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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Most real life projects I have worked on, already had lodash added, so you would just continue using it for convenience.
However, you are right for cases when you would add a whole library to solve a small case.