I would contend that there is a minimum set of tools across which an system will span. However, attempts to crunch the system into One True Tool will hit the d

I would contend that there is a minimum set of tools across which an system will span. However, attempts to crunch the system into One True Tool will hit the diminishing returns curve early and hard. Quite to the contrary, many users tend toward Object-Relational Mappers, just to ease the transition between data and logic portions of the application.