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We have about 30 services running in 4 environments, including dev. I desperately want a better kustomize that removes most of the boilerplate and adds linting (like, every process should have a ram limit, but no cpu limit). I estimate about 75% of the lines of YAML are redundant.

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Have you thought about using jsonnet? It has a good library for k8s (https://jsonnet-libs.github.io/k8s-libsonnet/). I like how I don’t need to worry about white spaces and how I can use functions to reduce boilerplate. For an example environment: https://github.com/ThatFave/homelab

Is that intended to be a good example? There's still tons of duplication between the environments.

Kustomize eliminates the vast majority of the duplication (i.e. a unique fact about the cluster being expressed in more than one place), it's just the boilerplate that's annoying.

Not a good one, no. I am currently in the process of rewriting this, so that I eliminate duplicate code. The language has the potential, I am still in the process of learning. I also dislike boilerplate, but I think my example is still better than pure yaml.

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