I find the lack of language level locking a benefit in Swift, using GCD is really easy now that the syntax is much more polished. I have yet to run into a race

I find the lack of language level locking a benefit in Swift, using GCD is really easy now that the syntax is much more polished. I have yet to run into a race condition. When I worked (years ago) on a 3D game engine in C++ we actually removed most of the multi-threading because it was too hard to reason what it was doing and avoid threading errors and race conditions.