The correct legal answer is not necessarily the obvious, moral, or "right" answer. A tomato is the fruit of the tomato plant. But a farmer would likely get the wrong answer if he asks a botanist whether vegetable import tariffs apply to his tomatoes because, according to the Supreme Court, a tomato is legally a vegetable.
It's even more complicated than that. A tomato is a real thing. So was the common trade usage at the time that referred to the botanical "fruit" as a trade "vegetable," which led to that silly, especially in hindsight, 19th Century decision.
The event that led to a conviction is a real thing, but a "crime," a "conviction," a "misdemeanor," a "felony" and an "expunction" aren't. They are legal creations to begin with. And "expunction" doesn't mean it never happened in the real world, just that the legally-created records of the legally-created process have been removed by yet another legally-created process.
As I tell my expunction clients, who are generally dealing with trying to get a job to feed their families or turn their lives around, nothing really goes away these days. Newspaper archives, social media posts, out of date private search databases, friends blabbing. Expunction removes the official record of the event (in some states, even the expunction paperwork and order are not maintained as an official record), but that does not mean people can't find out about the event or that a conviction took place at some time in the past.
Expunction laws usually prohibit employer use of expunged convictions (helpful but no guarantee), but then add to the mix, federalism and the idea that a state can't tell the Feds what to do in administering federal laws, and you can start having some real fun arguing this on either side.