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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.
I assume it has something to do with it being simpler, however realisticly I think it makes it harder to read, not sure, probably also something to do with the single line looking more efficient at a glance, despite being the same output in the same amount of code as lower ones. Just a guess though.