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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'm no expert but I think they're saying it's not good practice because not only is it overcomplicated for a fairly simple task, it also would probably suffer a bit in performance compared to the other solutions. That's just my assumption though and I am not great at evaluating whether or not a solution is good practice.
why not best practice?