Why not? It's true that religious topics have the potential for flame wars, and often don't match the goals of HN. Outside of HN, it's important for religion and culture not to be exempt from rational inquiry, both by insiders and outsiders. If religious or deep cultural discussion were only permissible when a devotee is present, then demonstrably problematic religions or cultures would have an unfair and biased insulating shield to maintain their problems under the guise of false decency.

But specifically in this case where a very prominent culture intersects with technology in a very unique way, why can't it be discussed from a technological and anthropological perspective, regardless of who is around, and whether they are either not a member of this culture, or they are violating their local time's sabbath by doing so?