I agree with you. This is more like a clever solution than best practice.

Most of the people who write the solution in a 8kyu kata are new programmers, many of them don't even know what O notation is, I guess it's the highest ranked because it's easy to understand and easy to think about it. Kata tests do not measure performance, so it is not a flag. I agree with the down buttons. but i think that the kata tests will have any performance input like a lot of inputs or timing. I submit the sort version to, because is the faster way to write the solution, are only to instructions.

Agree. I wish there were down votes too. It may be missleading especially for novice programmers.