This. Disc priest on beta is pretty garbage, they literally have zero CC other than fear on a 45 second CD or MC/root if you choose it. They are still susceptible to dispel/purge. Their healing throughput is mediocre. They really don't bring anything worthwhile to any comp. This change will help them, but they will be far from overlords.
Than maybe they should fix Disc's underlying problems instead of giving them stopgap measures like this.