One of the reasons the “iOS-ification" of macOS UI suffers so greatly is that iOS is fundamentally a single-window UI. It literally doesn't have to contend with *any* of the issues that most Desktop chrome was designed to address. So of course it falls flat on its face when applied to macOS. Imagine if every year Apple tried to make iOS as "simple" as watchOS, with no regard for functionality, just stubbornly insisting "if we don't need it on the watch, we shouldn’t need it on the iPhone!”