Customization](https://istio.io/latest/docs/setup/additional-setup/customize-installation-helm/#advanced-helm-chart-customization) can be used to allow arbitrary customizations. If the change truly is generally purpose, it is generally preferred to have broader APIs. For example, instead of providing direct access to each of the complex fields in [affinity](https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/), just providing a single `affinity` field that is passed through as-is to the...