These Systems are specifically designed to assign "Overhead" for "Inventory Valuation" and to  absorb  "Overhead" during a given period so that the "Variances" are close to zero.

The reports are usually static or the report compares "actual" to "standard". The reports coming from the system are usually not designed to show trend analysis for costs.  Viewing cost trends is the most important tool for reducing costs.

The reports do not typically show data broken out in a useful manner.  i.e. Pareto analysis, detailed cost breakdowns for key products.

Since the data is not easy to use for cost analysis, most "useful analysis" is done on Spreadsheets with manipulated data.