For the sake of history, `range` was found/coined by Andrei [1] [2] as a way to overcome the issues with the iterator pattern (in STL). I wish Eric Niebler credited Andrei somewhere, but I couldn't find any.

Honest question: why should I use ranges after all?

As I understand, ranges are the core of idiomatic D and they are not worth it (as per OP)?

AFAIK, ranges (at least in D) are not thread-safe [3]. So what real benefits does it bring?

[1] https://accu.org/content/conf2009/AndreiAlexandrescu_iterato...

[2] http://www.informit.com/articles/printerfriendly/1407357

[3] https://github.com/carun/parallel-read-tester/commit/3e69da4...