IMHO it's the problem with.com domain policy – no top level domain should allow the use of different scripts/alphabets. Countries using cyrillic don't allow using cyrillic IDN domains under.ru and.bg for example, there are . and . for that. In the same way.com should allow ASCII only. Yes, there is theoretically homographs problem with top level domains as well, but it is realistically controllable.
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IMHO it's the problem with .com domain policy – no top level domain should allow the use of different scripts/alphabets. Countries using cyrillic don't allow using cyrillic IDN domains under .ru and .bg for example, there are . and . for that. In the same way .com should allow ASCII only. Yes, there is theoretically homographs problem with top level domains as well, but it is realistically controllable.