Comment by robbiet480

The filtering entitlement allows us to decrypt messages and, depending on the content, choose to not send any notification (for example if a user sends an app specific command, like asking for a location update). The example you linked requires that a notification is emitted at the end, which we don't want.

Zac also just let me know the other reason we need filtering is so we can properly unsubscribe users from notifications when one is received from a server they no longer are connected to.