Earlier quoted context omitted.
This is also likely a performance nightmare. Funny that they mention that "new hardware has enabled us to..." which means that this will perform poorly on old devices. At a previous company, we were forbidden from using translucency (with a few exceptions) because of the performance cost of blending. There are debugging tools we'd use fairly often to confirm that all layers were opaque.
Unlikely. Frosted glass blur was introduced almost twelve years ago in iOS 7, and was supported all the way down to the iPhone 4. Many apps like control center have used a full screen blur without any performance issues for a long time. Apple at the time created their own 'approximate gaussian blur' algorithm specifically to enable this, and it ran crazy fast on devices where a simple gaussian blur would barely achie…
And yes, later iOS on early hardware was huge PITA and slowdown.