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Homograph detection isn't about prohibiting mixed characters; it's about considering letters that look the same to be the same when checking for existing duplicates.

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It's not that simple. A lot of different characters may or may not look the same depending on the typeface used.

Yeah, if I were doing it I'd probably tend to be pretty cautious - if I see any popularly-used typeface that would confuse the characters I'd mark them as homographs.

It would absolutely have to be a pretty labor-intensive, manually-maintained database.

And thus extremely error prone. I think introducing IDNs at all was a mistake given the (security) cost-benefit tradeoff, and the best solution would be to scrap them but I realize that is unlikely to happen. Domain name script is probably the last place where cultural imperialism needs to be fought, it's just empty PC posturing and a way to extract some more easy money from gullible domain owners.

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