You're assuming that judges are slower to resolve ambiguities than regulators are. My experience with regulators has been that often they not only let the law be ambiguous for years despite repeated requests for them to make a decision, but are then fond of retroactively and suddenly "clarifying" things in response to shifting political/media winds. Nor do they feel any obligation to be consistent with past rulings.

Courts are at least expected to make progress on cases as they are brought, to be roughly consistent with past case law, and they aren't allowed to just refuse to make a decision for a decade and return to it when it's suddenly in the newspapers.