I'd much rather pay for reads & writes directly rather than guessing at how my CPU and RAM will translate to the reads and writes that I need. RDBMS capacity p

I'd much rather pay for reads & writes directly rather than guessing at how my CPU and RAM will translate to the reads and writes that I need. RDBMS capacity planning basically goes: 1. How much traffic will I get? 2. How much RAM & CPU will I need to handle the traffic from (1). With DynamoDB, you can skip the second question.