They'll never do that again. They took the opportunity when given to move to pre-recorded, overproduced crap, and simultaneously gave up all accountability for having software ready to demonstrate on stage. We know now that Apple Intelligence features were mostly non-functional in June 2024, and were entirely mocked up for the keynote video. That never would have been (as) possible before in the live setting.
This format basically allows them to present vaporware, and after a couple of years of it, they finally did. It also allows to announce unpopular, anti-customer changes, without having to suffer boos being broadcast to millions of watchers around the world. Imagine the iPhone 12 announcement in front of a live audience: "Yes, we are removing the absolutely necessary-to-use-your-device charger from the box, and the headphones while we're at it. We're going to save millions of dollars per quarter on packaging and shipping alone, AND ...instead of lowering the price by $40, we're going to raise the price of iPhone by $130. Isn't that great?!"