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Pros and cons of DynamoDB
What the author suggests is to use it in cases when there are not so many writes to DB and where eventual consistency is fine for the app. The writes are pretty expensive after all and could lead to problems with eventual consistency.
And the main issue from my side is that DynamoDB is a black box for you and you can not debug and check storage logs, so you can not know why your storage is slow or why the cost is extremely hin.