is it not open assembly?

open weight models are better than open-assembly binaries (as you put it) because models are grown like plants, you can shape the open-weight model in a direction you want by feeding it more data and compute (aka finetuning).

which is something that is impossible in a binary.

embrace the new paradigm and it's tradeoffs. without scoffing at semantics and criticising from an armchair.

I'd encourage you to start referring to it that way,then.