I think the problem the parent was getting at is that parts new enough that regulations have not been written are automatically non-viable due to bureaucracy substituting outsourced regulation documents for in-house technical expertise. With the end result of regulators being incapable of making technical decisions that fall outside the already written regulated scenarios.

I would hope that this is less of an issue in nuclear regulation, due to them hopefully having engineering resources on staff. But I do know it's a common problem with less technically focused branches of government.