Right, but that requires your new workloads to fit well with the resources you have committed to. If you've committed to many small machines, they may not be we

Right, but that requires your new workloads to fit well with the resources you have committed to. If you've committed to many small machines, they may not be well suited to an especially heavy workload. If you've skewed your commitment towards a large amount of memory per compute (or vice versa), you can find yourself with lots of RAM (or compute) and no natural use-case. At the bottom line, commitment impedes change.