I wouldn’t call it dangerous, just meaningless. A lot of the discussion in this thread dives deeply into the technicalities of Unicode. All of that is correct,

I wouldn’t call it dangerous, just meaningless. A lot of the discussion in this thread dives deeply into the technicalities of Unicode. All of that is correct, but a bit besides the point IMO. I think the real issue is that “reversing text” is fundamentally an operation that only makes sense in Western alphabets — the complexities of Unicode just reflect that. This is a bit hard to fathom for people who grew up with such an alphabet (this includes me), where there’s a rich tradition of games based on shuffling letters. It’s not just reversing; my understanding is that you can’t meaningfully define the concept of an anagram in many writing systems.