I’ll go with the fallible humans who don’t take minutes to make the wring call or pull back play to retrospectively award penalties after play has moved to the other end of the the pitch.It will still have the same human beings making the final decision Var provides a second chance to make a decision - hopefully the extra thinking space and opportunities for replays will lead to more correct decisions. The truly marginal calls that could go either way will still be at the mercy of human failings. Whether those failings are then due to incompetence of bias hardly matters.