> [...]And because federal agencies were allowed to deploy the product during the review, GCC High spread across the government as well as the defense industry. By late 2024, FedRAMP reviewers concluded that they had little choice but to authorize the technology — not because their questions had been answered or their review was complete, but largely on the grounds that Microsoft’s product was already being used across Washington.

This sounds like the crux of the issue. The combination of: "tool can be used during analysis" and "analysis takes long" shifts the barrier of rejection from "is this tool safe?" to "is this tool so unsafe that we're willing to start a fight with a lot of other government agencies to remove it, find an alternative, etc?".

Not criticizing FedRAMP. Proper security review takes time. And probably more when dealing with vendors.