Swift was the beginning of the end of macOS. It signaled the exit of a ton of NEXT people, and a completely new regime -totally disconnected from what came before- being allowed to run the show.
The quality drop around the time it was introduced was staggering. One example: In the Objective-C days we had extensive, reliable and up-to-date documentation including entire developer guides (book-length PDFs) for all aspects of the OS. These days, besides half-broken frameworks and missing docs, you're lucky if you find out how things work from a WWDC video.
How can one argue against the disaster that is Tahoe? What kind of engineering culture not only produces something this broken but pretends it's OK? Jobs would have fired half the OS division for something half as bad.