How an easy self review can be conducted with map file of the workbook, explained here with details on what kind errors can be detected. It is gold standard in detecting formula inconsistency, which plagues many models. So, as a manager this is a must have utility for your team involved with financial models build or review.

Why do financial models become more complex? Have you come across the situation where after doing the complex calculations you realize that it is of no use? Should you include everything all kinds calculations, balance, permutation / combinations without knowing the end goal of the model?

Building a first financial model from scratch can take weeks, often at the cost of sleep and sanity. By the time the second model comes around, even for a different business, it's common to notice large parts of the logic repeating. And the same happens in the third. That's when the thought arises: Should there be a universal template that contains all the logics used repeatedly? Would that save time in the long run?