I have always considered this a weird effort. Foundation is not Swifty (delegate protocols with optional methods, etc.). Why do we need a Swift implementation of NSMutableArray or NSNumber? Just use Array or Int/Double!

Of course, a core Swift library for URL handling is important! And on macOS/iOS it can be implemented on top of Foundation. But I don't think that library should come with a bunch of geometry, collections, or number formatting types as well. µframeworks are Swifty. The SPM documentation says something like "in general more modules is better than fewer modules", so it's weird to have a giant framework as an official core library.