Luckily, things like icons, colors, and typography are easier to iterate than userflows, information architecture, and features. They’re also the elements that take more time than expected to craft, so I can see all of these refinements being the most likely to be cut from a tight deadline, and the first up to be revisited by the design team before the official release, or quickly thereafter. If that awful Safari icon bugs you, imagine how the designers at Apple must feel.
Its true that its just the start and a good start. Things will get better soon.