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Yes, you should care. Different MDM architectural styles have different strengths and weaknesses and you should be aware of what they are as they pertain to your functional requirements — (see my answer to the question about independent MDM cost estimates.) For instance, persistent MDM hubs physically store all the master data, including descriptive attributes. This could be overkill in environments that really need fast match and link capabilities. It's an important set of decisions.
But now that I've said that: don't care too much! Philosophical debates on the architectural styles can delay an otherwise on-track MDM plan. Also, don't burden your business users by trying to educate them on architectural nuances. In the end, what they want to know is why MDM is different from incumbent technology solutions, and how it will help them meet their — and the company's — goals.
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