I wondered how the Hindu-Arabic numerals gained quick acceptance in Europe and East Asia. Why is it this case with numbers but we cannot easily replace letters and scripts, like the Cyrillic, Hangul, Katakana-Hiragana and Chinese scripts. The Europeans for example, used Latin numerals and the East Asians, I don't know.

What was the reaction of the peoples in having the traditional and old number system being replaced with another? Well, we're not going to replace our alphabet just because we find another that works better?