Apple very rarely admits mistakes. The fact they're rolling back some of the extremeness in Liquid Glass and actively mentioned in the keynote that they very seriously took the user feedback shows just how bad it was, at least initially.
It was literally the first specific announcement they made after they finished their introductions. Not anything iPhone related; they announced that Liquid Glass on macOS would move towards the older design. Goes to show that a year of anybody with any sort of clout complaining about the thousand little cuts of Liquid Glass on macOS will get a company to respond. That and the guy who announced it last year fled to Fa…
I still would have liked a more genuine walk back (they sold it as "iterations and adjustments" as if the rewinded stuff were new ideas) but overall reassuring.