As a facebook user, I'm happy I'm not longer gonna get "your friend has invited you to this app..." notifications. As a developer, though, I can see why this would be frustrating.
The main frustration here is that the Requests are those that are actively initiated by a user. A friend is actively trying to invite you to the app, rather than just an app spamming those who have once installed it.
So many new apps launch that banning notifications by app gets tedious. They all suck in different groups of your friends, so banning notifications by friends is tedious. Not forever, perhaps, but long enough to make you think ill of Facebook.
We've been there before, and even though as a developer I miss it, it was the right thing of Facebook to do.