It's not lip service if I can send messages and other people can receive them.
Again, the status quo is you can't do that. Hell, in the spectrum of being dragged into reasonableness by the EU kicking and screaming, Meta is orders of magnitude below Apple here.
I mean, we can debate the finer points of the implementation once it's live, but for now this is nothing but positive movement. If people got over rejecting cookies they can get over dismissing warnings regarding interoperability, and if they don't, the same regulators have a history of re-spanking unruly malicious compliers.