Is the Brothers K more or less effective without the planned

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Is the Brothers K more or less effective without the planned sequel that Dostoyevsky alluded to in the introduction having ever come to fruition?

Dostoy implied that this would have been the more important work and it certainly could have answered a lot of the questions one is left with after finishing the first such as whether Dmitri really did kill Fyodor, whether his escape is successful, and whether or not Ivan recovers but the original novel is in some regards more powerful with the answers to these questions left ambiguous.

Would you have preferred for Dostoy to have finished his sequel or is literary history better off without it?