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RubberDuck knows what he speaks about Chinese IDNs.
Actually, PinYin can be a lot faster when the output is in Chinese.
That is because most PinYin input has AI built in. For example to type the Chinese IDN equivalent of UnitedStatesOfAmerica.Com, the PinYin method takes just two key strokes (i.e. m and g) to create 美国, which means UnitedStates or UnitedStatesOfAmerica.
In fact proficient Chinese typists can type Chinese character content/material at speeds equivalent to hundreds of Englsh words per minute. Several pages of English text, when translated into Chinese, may occupy but one page or so in Chinese, and with far fewer "words" due to the simplicity of Chinese grammar which obviates the need for many grammar-supportive words that are required in English.
That inputting or outputting in Chinese characters is necessarily slower than in English words is a myth. With the right AI-supported text editor and some use or practice, it is usually faster than inputting and outputting in English, and several times faster for proficent typists.
In other words, the upper typing speed limit is much higher for Chinese characters than for English words in terms of equivalent information throughput.
Even so, there remains a lot of room for AI improvement and speed efficiency in Chinese character input and output. The situation can only get better in the future.
In fact, it is also much easier (AI-wise) to do voice input/output in Chinese since there is always only one sound/syllable for each Chinese character and therefore the parsing of each character or its sound and the translation between a character's sound and the character itself is far simpler and easier than the case of multi-syllable words (as most English words are).
In decades past, the progress was somewhat slow, but has picked up in recent years. Money for R&D plus research talent used to be meager in this area until recent years.
Eventually vocal input will take over, imho. Monosyllabic languages should be the easiest for high-accuracy vocal input. The Chinese language grammar is also extremely simple, very close to a computer language. There are no such things as tense (past, present or future) etc., or complicated prepositions. For example, instead of saying: "I will be going to school today", Chinese equivalent would be "<subject> [<time-tag>] <action> <object>" or literally "I today go school." So man<-->robot/machine interaction will be far simpler in Chinese than, say, English.
There are other advantages, but I don't intend to make this an essay.