The key part of your energy dissipation requirement is that it’s per rack. A home user wouldn’t need an entire rack of compute, so a case built for only one or two boards would have nowhere near the same cooling requirements.
Also designing a different power supply is very trivial. The silicon itself is only running at 1-2v, it’s not like they’re passing 700vdc through the actual compute boards.
The key part of your energy dissipation requirement is that it’s per rack. A home user wouldn’t need an entire rack of compute, so a case built for only one or two boards would have nowhere near the same cooling requirements.
Also designing a different power supply is very trivial. The silicon itself is only running at 1-2v, it’s not like they’re passing 700vdc through the actual compute boards.