I am from Czechia, where many diacritic marks are used. CZ domain registry makes periodic surveys whether to allow IDN domains for .cz, and 'no' wins consistent

I am from Czechia, where many diacritic marks are used. CZ domain registry makes periodic surveys whether to allow IDN domains for .cz, and 'no' wins consistently with ~ 2/3 majority. See https://www.háčkyčárky.cz/ https://www.xn--hkyrky-ptac70bc.cz/ (there are also info in english). The main argument against is that everybody is accustomed to the current situation and knows that when a brand contains diacritic marks, they should be removed when entering URL. If IDN is introduced, it would be confusing as some would use ASCII version, some IDN version, while most would just buy two domains instead of one.