Traditionally courts have seen themselves as the guardians of fair procedures. The substance of administrative decisions is for the decision-makers: they are the ones entrusted by the legislature with making decisions, and they have the expertise to do so.
Courts have been much less deferential in addressing the processes by which those decisions are reached. When it comes to the fairness of procedures, administrative decision-makers have to get it right. If they do not, courts stand ready to correct them.