I think the new design approach here is a clever nudge towards "Neo Skeuomorphism". Interface design is clearly heading in a much more skeuomorphic direction (see: AirBnB redesign) lately with the rise of AI. Liquid Glass is an apt way to provide more material-realism without devolving back to the objective realism that the old Skeuomorphic style pre-2013 represented.
Time and time again I see people bemoan Apple's UI direction and then sure enough within a year or two it becomes ubiquitous as web designers adopt the patterns for their own work.
The funny part is that the lede is getting buried here. The big story is of course the universal design _across platforms_. We're now ultra-ultra close to a unified OS, something that has been in materializing extremely slowly over the past decade and a half.