alt Hacker NewsYes but I wouldn't say their capabilities have been "greatly" degraded. It's still very much in the "push a button and have someone's entire life history up on the screen" territory.
Degraded would be "it is impossible for them to know anything about people unless they send dozens of human agents to stalk them".
I think going from "lol we can read and store all the emails sent by everybody" to "lol we can hack any specific person and then read their emails" indicates a massive loss of capability.
The first approach enabled them to find targets that were not on their radar based on message contents, they can no longer do that.