First we should reach an agreement on the goals and the semantics of this new label, then we can apply it accordingly. Most of the open issues are already triaged/acknowledged, so they won’t need the label. We could still add it to issues with no replies or that lack certain labels (e.g. type-*).
My goal was to make sure that all new issues get looked at by a triager and/or core dev. The untriaged label can be used to automatically mark these new issues, so that triagers can look for them. Triagers can decide to remove the label or ping the relevant experts and let them remove it.