The right to strike certainly does.
What the essential services provisions do is to allow those areas—and certainly even the Supreme Court contemplates this—so that the safety and security interests of the public can be protected in this way. However, it's the balance that you need to strike that gives the bargaining agents—since they're the parties who are interested in a strike, if that's the process they choose—the ability to assist in the determination of the numbers of employees who would be designated as essential. It's not a unilateral choice anymore.