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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.
If it reflected the highest challenge completed, then it would provide incentive to users who may feel the need to 'lookup' solutions for harder kata.
The way that it is implemented now doesn't necessarily require grinding. If you complete several high-kyu kata, you can definitely improve your ranking faster than, say, completing forty or fifty low-kyu kata.