If I have any argument, what I'm in favor of is situating our use of terms like this in the context and history of the free software movement, even absent some "defining authority" like the OSI and the FSF. I'm open to other definitions and to observations that unfortunately "open weight" is a term that was co-opted almost as soon as it was coined. But it's not about semantics for me, it's about promoting an understanding of these terms and ideas that is continuous with the free software movement that birthed them. It's not about dictionaries for me. Saying "this doesn't fit the category" in situations like this isn't lexicography so much as it is politics (or less grandiosely, a critical analysis of marketing materials).

> I don't think we have a proper term for what you are reaching for, and proper open-source models (training, training-data, etc. being fully open) are scarce.

I think you're very much right that we don't have a "brand" with either the same kind of institutional backing as terms like "open-source" and "free software" or a wealth of examples to point to.