Honestly I'd much rather have some configurable yaml than some obscure app in the middle of your cluster that reads CRDs when what you're doing is just adding a side car.
At least this way you can tell if your local yaml is applied or not without a complicated diffing algorithm that compensates for an in-cluster modifier.
At least this way you can tell if your local yaml is applied or not without a complicated diffing algorithm that compensates for an in-cluster modifier.