Some open source projects prefer to avoid discouraging prospective contributors, even if they know that the task the contributor is currently working on has no chance of acceptance. The hope is usually that avoiding discouragement will build a larger community, and that contributors will eventually realize the futility of their efforts or otherwise organically move towards making productive contributions to the project.
What wacky logic. If I am going to spend valuable time helping a project only to let the work simply be wasted, I will organically move to some other project that values my contribution enough to not waste my time.
