That's about my experience as well. I started playing with Swift when they launched it, and have dabbled here and there, but I don't have an iPhone or a Mac, so

That's about my experience as well. I started playing with Swift when they launched it, and have dabbled here and there, but I don't have an iPhone or a Mac, so it's not very useful unless I really need to develop something for iOS (had a hackintosh for a while until my laptop died). I have since moved my prototyping to React Native targeting Android. There are a lot of things to like and dislike about each language. I use Go at my day job and Rust for most side projects, and I feel I need to be careful with both. Go makes concurrency easy, which also makes it easy to make mistakes. Rust makes concurrency safe, which also makes it hard to optimize. I'm faster with Go in prototyping, but more confident with Rust not breaking at launch. Learn them all. If you're an experienced dev, it'll take you less than a week to be comfortable with Go if you've done any concurrency, two weeks for Swift, and about the same for Rust (maybe more if you have little to no FP experience).