I work in Swift 7 days a week (sadly 7) but I am quite happy despite the changes, it's an open source language built entirely in the open by contributions from people who care. What the hell is there to complain about, would you rather work in 50+ year old cobol? I've used ObjC since the NeXT days and despite much of our codebase (not our part) is still in that language I am always glad to be working on our part in a nice modern language. It's only 3 years old. Go is almost 5 (announced like 8 years ago and started 10), Ruby and Java are antiques in comparison at 20+, ObjC itself is 30 years old, C is 40, C++ is around 25. Rust is about the only comparable aged language, and it isn't used in any single environment as large as iOS and OSX. Swift is 3. Yet it's fun and productive to work in (other than compile times which suck, and debugging which is painful sometimes, and Xcode is ugh). Sure often I have to look up what the current syntax is, but it's still lightyears easier than remembering C++ details (another language I spent a fair amount of time in in the past) which also change from year to year. Debugging STL still gives me nightmares.

Cyanide is considered harmful. Opinions are just opinions, but calling something harmful when you just don't like it should be considered silly.