If you're on the Mac, your process is probably linking the Swift runtime anyway. Foundation.framework is being reimplemented in Swift, so if your process links Foundation (or even just CF), you've got the Swift runtime.

It’s a nicer experience during development out of the box, without having to do anything manually.

Swift Backtracing is not only about the symbols, it’s also interactive and lets you attach the debugger after the process crashes, which is neat.

I don't think <stacktrace> is async signal safe, and thus shouldn't be used for in-process crash reporting.