S3 will never become a PF requirement. Yoshida mentioned in his interview that it's meant for personal use. Although it is a great opportunity for a performance requirement, this unfortunately won't be the reality.

@Callback: It seems like you had a tough time on PF groups in attempt to clear content. I can only speak from personal experience, but if clearing Savage/Extreme primals is a player's goal, they should invest the time and energy in finding quality players that share the same goal. You technically can't invade a PF, as the premise of it is to extend an invitation to players server wide that want to complete content.