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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.
That's your opinion and it's fine, but I think it's no more than that: your opinion.
Personally I do prefer to cover all possible cases that I can think of, even if they aren't necessary to pass the tests, regardless if the kata is actually meant to be like that or if the creator didn't take such cases into account by mistake.
In the real world you will often need to cover all possible cases in order to prevent errors, so this way it helps me develop that kind of skills, if you want to call it like that.