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I work for an energy consulting firm and we are using OpenStudio to model everything from multifamily to office high rise buildings. If you already know how to use EnergyPlus, even at a basic level, OS can drastically reduce modeling time. I think it is inaccurate to state that "it is apparent that it will never meet the needs of our consulting firm where speed and accuracy are essential" when talking about OS. The development is happening at a very rapid rate and it is getting better all of the time. My company does a high volume of energy modeling and on very short timelines and we have been successful with OS.

If you do want to use OS using the script functionality is extremely import in producing models quickly and accurately. If you do not wish to learn how to write basic ruby code then OS is not for you. If you are willing to learn, then scripts are by far the most powerful tool and are what makes OS a viable commercial modeling software.