A DC busbar can propagate a short circuit across the rack, and DC circuit protection is harder than AC. So of course each server now needs its own current limiter, or a cheap fuse.

But I’m not debating the merits of this engineering tradeoff - which seems fine, and pretty widely adopted - just its advertisement. The healthcare industry understands the importance of assessing clinical endpoints (like mortality) rather than surrogate measures (like lab results). Whenever we replace “legacy” with “cloud”, it’d be nice to estimate the change in TCO.