DM subjectivity and areas of intervention are, in my opinion, an important problem that needs to be resolved. The determination of the weighting method, the choice of normalization are other important gaps. The most important problem is that the choice of MCDM. When all of these factors are considered together, it is a clear fact that the choice of method directly affects the ranking results. Although not emphasized in theory, the assumption of 'equivalent methods', which is widely adopted in practice, can be questioned more in my humble opinion.