Im with ya on all that. It isn't that big of a deal to me either. I only have about 1-3 friends who play on a different platform that I would maybe occasionally party up with. So I dont particularly care for the feature - I'm not bothered.
It's just worrying how they keep delaying it. They needed to stop slapping rough ETAs on it two delays ago lol. And as you said, there is nothing else on this "roadmap" which is a bit disappointing. You would think they would do something to tweak tournaments, clubs, training, or something new. I dunno. Psyonix worries me :P I love the base Rocket League, but I fear for its future if they don't get their stuff together soon.