I have to strenuously disagree with your description of China (a country I have visited, and a country where many of my friends grew up) and of Chinese (a language I have been speaking since 1975). No, no, no, and no, much of what you say is just flat wrong and it makes me wonder how closely you are observing the environment you live in.

First of all, many people in China that only speak different versions of Chinese are not best described as "monolingual," because they know two languages (Modern Standard Chinese and whatever the local Sinitic language, that is "Chinese dialect is) and have to grapple with language differences in their everyday lives. Southern Min and Mandarin (the two Sinitic languages I speak best, with plenty of monololingual native speakers, but with plenty of bilingual speakers of both) are as different from each other as English is from German or as French is from Spanish. They are cognate languages, yes, but they express many of the same ideas differently both as to vocabulary and as to grammar. I also speak some Cantonese, and I can give an example of language differences between Cantonese and Modern Standard Chinese (Mandarin). Many more examples are possible. How you might write the conversation

"Does he know how to speak Mandarin?

"No, he doesn't."

他會說普通話嗎？

他不會。

in Modern Standard Chinese characters contrasts with how you would write

"Does he know how to speak Cantonese?

"No, he doesn't."

佢識唔識講廣東話？

佢唔識。

in the Chinese characters used to write Cantonese. As will readily appear even to readers who don't know Chinese characters, many more words than "Mandarin" and "Cantonese" differ between those sentences in Chinese characters.

You write, Chinese is so outdated and obsolete in so many ways. It has not evolved, yes you could understand today a 4.000 year old writing but at what cost?

You may have heard some Chinese person say to you that Chinese writing has changed so little that today's literate Chinese people can read 4,000-year-old writing, but there are two problems with that statement. First of all, writing in Chinese is only about 3,000 years old. (Writing originated first in the ancient Fertile Crescent and in Egypt, and only later in China, independently.) Nobody can read 4,000-year-old writings in Chinese, because there aren't any to read. Second, anyone who can read ancient writings in Chinese can read them (as I can) because they have specifically studied the differing vocabulary (see above) and differing grammar (see above) of ancient Chinese written in Chinese characters. Yes, Westerners can learn Latin as a language for reading old books and inscriptions on monuments, and very little has changed about the shape of letters of the Roman alphabet (what I'm typing right now) in a long time. But that doesn't mean that languages of the West that use the Roman alphabet don't experience linguistic change. In fact, ALL languages everywhere experience linguistic change, whether the speakers of those languages admit it or not.

we have powers that Chinese don't have, like using tones for emotions

The statement here seems to say that Chinese doesn't use sentence intonation to indicate the speaker's mood or tone. I can assure that it does, and I wonder how well someone can speak Chinese who has never noticed that.