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I have been involved with db projects for some 30 years and the majority have been very successful.

The key components-
The architect must be notated as continuity is essential.
The architect must prepare and coordinate the ERs, and I have never been involved in a project where we didn't do so. They must be full and clearly defined.
The contractor needs to be selected on a 2 stage basis and to have been involved in the design development. It goes without saying- he must be reputable and the architect must have confidence in him.

Follow these 3 rules and success generally follows- indeed, the traditional contract form in my view does not work nowadays. Buildings are generally the sum of multiple components, often designed by specialists- and so a wider umbrella of design responsibility is only realistic.