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We piloted two jobs ago and aborted. Wouldn't recommend at your size because it seemed to do effectively, you need a "Backstage Team" which is not Ops Team who occasionally does Backstage work. Probably why Spotify is considering it because sweet consulting money. While I don't know your exact situation, I'm currently at company of your size engineers and stop torturing your Developers with Helm is off the shelf advi…
I'm somewhat new to helm, after a year I feel like I'm pretty good at it, but struggle to teach other ML folks what I've learned the hard way over the last year. Some of that is helm, plenty of it is Kubernetes. Most of our charts are ingress, service, deployment, service account, scaled object (keda), but there's plenty of small variation even across ML applications, plus the different needs of other teams. Any good…
However, biggest is it's just YAML patching. So you don't have this {{if such}} littered throughout your project that people can't easily pick up. Values is biggest reason I see people want Helm but if it's all env variables, kustomize lets you put in .env file it turns into config map and injects into deployments.
It's possible Kustomize doesn't fix your problem esp if Developers have decided it's not their problem. I just find Devs find Kustomize much easier.