Yeah that struck me too. I can see the reasons why you'd want it but the collateral damage on that must be huge.

For example do they check for the common but nonstandard transliteration systems arabic speakers use? There have to be similar systems in other languages that don't use the roman or cyrillic alphabets too right?

Or for that matter what about languages twitter simply isn't aware of? There are thousands with native speakers after all, does this make it basically impossible for them to organically use twitter together?