I’m taking a wild guess (fueled by hopes and dreams) and calling it now: iOS 18.4 – as well as whatever other updates come for iOS 18 – will now all be releases more akin to Snow Leopard ones than not.
Obviously per an Apple spokesperson the meat of it is now coming within ‘the coming year’. As such, they’ll likely take their time actually laying the groundwork FIRST, to THEN have Siri move “through the system in concert with you” as they envisioned it.
Willing to eat crow on the lack of new features though. This was a guess after all.