Weights are being retrofitted to favor a preferred option, which destroys the value of the method, because the weights should have been agreed before any scoring took place.

The method itself has failed, because no formal scoring framework can produce results that survive contact with the political dynamics of a real engineering organization.

The scoring should be repeated several times with different scorers, because individual differences in how each criterion is interpreted account for most of the variation in the output.

The wrong criteria were chosen at the start of the analysis, because a sound choice of criteria would not have produced a result that any stakeholder wanted to overturn after the scoring step was completed.