Yeah, the core reason to use Helm is for the ecosystem. The value that comes from being able to quickly set up and compose packages on https://github.com/helm/charts/ is larger than the (very) annoying YAML templating and chart reliability issues.

Lots of Helm charts have bugs, but lots of PyPI/NPM/Maven packages have bugs as well.

Jsonnet, Cue, and operators are nice, but unless someone can create an ecosystem that is as valuable as the Helm ecosystem, I don't see Helm disappearing.