NTSB and FAA are two different agencies, with overlapping but different charters & objectives. NTSB is always immediately “pressuring to act” because their charter doesn’t task them with considering any factors other than the perceived or suspected danger.
As an example, the military typically institutes an immediate “stand down” in instant response to an accident, grounding the type worldwide even though they may yet have no clue what caused the accident. You can’t do that in the civilian world, although NTSB as an agency would doubtless love the policy.