That said I dislike the use of frosted glass in user interface design, and feel it was a step backwards for Mac OS when it was added. Designers (hypocritically including myself - I use it too sometimes) are so seduced by it. But in practice it’s never ideal. Especially if the content behind the panel is dynamic or user generated.
It’s the brushed metal of the 2010s, I’m surprised that it leaked out of Windows Vista into everything else!