According to the show’s producers, Rossum left to pursue the next chapter of her career.
Nevertheless, that issue was resolved shortly thereafter and didn’t seem to have been directly involved with her decision.
Speaking of, she is currently filming a role in the upcoming Peacock drama series, Angelyne, which comes from show creator Sam Esmail, Rossum’s Emmy-winning husband.
While Emmy Rossum didn’t specify a concrete reason why she wanted to bow out when she did, that decision did follow a contract dispute in late 2016 regarding how her pay related to co-star William H. Macy, who earned more than she did in previous years.