It is frustrating to other researchers and may be self-interested as other commenters mentioned. But these models are also now capable enough that if they are going to be developed, publishing architectural details could be a serious infohazard.
It's good when AI labs don't publish some details about powerful models, for the same reason that it's good when bio research labs don't publish details about dangerous viruses.
It's good when AI labs don't publish some details about powerful models, for the same reason that it's good when bio research labs don't publish details about dangerous viruses.