With gitops repos that are using Argo CD, rendering via helm is only done at deploy time on the cluster. There is no way to preview the changes in a pull request for developers to know the fully rendered changes prior to the deployment.

This has historically created incidents, especially for helm charts that are deploying open source helm charts / code. It could be that a new version will have many new default values that are hard to predict without previewing the rendered manifests. There's also examples of incidents where a user can add a value they believe is only in one environment but due to the complexity of the helm chart actually appears across many environments with unexpected behaviors.

A consistent way to prevent such incidents is to allow developers to preview the changes as part of the pull request and require their approval of said changes. Thus not having this feature is a business risk and reduces the speed of migrating critical services for our business.