Agree totally. The solution to overcome those shortcomings in AWS, is to sort of put bandaid's with more services (at least their suggestion). I do understand, its not feasible to provide service which fits for everyone, however it will be good if they solve the fundamental problem.

One more to add in the list.

In DynamoDB during peak (or rush hour) you can scale which increases the underlying replica's(or partitions) to keep the reads smooth. However, after the rush hour there is no way to drop those additional resources. May be someone can correct me, if I am wrong.