Why do China people and middle school students learn classical Chinese, but not many people use it completely?

Now all middle school students study ancient Chinese. Why? Because ancient Chinese is concise and concise, and some of them are full of wisdom and philosophy, we learn it, first, to inherit valuable cultural heritage, and second, to enrich and improve our cognitive ability.

But it is a fact that few people use classical Chinese now.

Think about it. If you talk to others in classical Chinese, they will say that you are "pretending". Why bother? If you write articles in classical Chinese, how many people will like to read them? Therefore, the use of classical Chinese has been in the trend of elimination (except for specialized researchers), so it is not surprising that some things in the past are not used now. Such as abacus, spinning wheel, kerosene lamp, dung dustpan and many other things. , which is no longer in use. This shows that history is developing and human beings are making progress.