When ambiguity is still normal friction
Migration ambiguity is still more ordinary when your team is gathering exports, identifying likely record questions, and narrowing what needs review without yet changing the real go or no-go decision.
Normal friction can feel uncomfortable, but it does not automatically mean the migration path is unsafe, broken, or already disproven.
When ambiguity becomes a real blocker
Treat migration ambiguity as a real blocker when it starts weakening stakeholder confidence, changing whether the trial can answer the real question, or making the consequence of guessing too high to continue casually.
At that point the safer move is clearer guided review, not more optimism or more vague reassurance.