If you have two ways of structuring something, and the worse way is so predominant that it obscures even the existence of the better way, that's a dead end in my book. In the pre-structured-programming days when people had to fight tooth and nail to get people to acknowledge the value of `if` and `while` over `goto`, we would have also called `goto` a dead end; it's plain to see that we would be in a worse place today if the structured programming advocates had not managed to convince everyone of its superiority.

> Results from my quick search on structured/unstructured concurrency were all references to Swift. Is this a Swift thing?

I have no idea whether Swift supports it, but no, it's not a Swift thing any more than `while` and `if` are a Python thing. I highly, highly encourage people to read the linked blog post, it will be the best use of your time today.