Personally, I think this is related to the popularization of education in China and the overall improvement of the quality of the whole people after education. In the past, parents didn't understand education, and their educational level was not high. They rarely had their own criteria for judging the knowledge explained by teachers. But now, after the popularization of compulsory education, parents have more or less knowledge reserves, and teachers can't be careless. The knowledge explained must be accurate and effective in order to better guide students. Therefore, the education industry will naturally become more and more strict with teachers' comprehensive quality.
The threshold of teachers should be very high, and getting higher and higher is not a reason, but a must. Over the years, we can feel the deficiency and weakness of cultural education from all aspects, whether it is writing or speaking. People who listen to music can certainly feel this. Those of us who grew up listening to Chinese songs in Hong Kong and Taiwan can feel the beauty of the cultural language in the lyrics, which makes people feel relaxed and happy. However, there are few exciting and throbbing things in the mainland thesaurus. Many of them are simple and straightforward, with a sense of improvisation, unclear logical level, and some are even absurd, expressing emotions and describing things, which are well-founded. The interpretation of humanistic consciousness is very confusing, so a teacher's thinking height, humanistic connotation and moral accomplishment are very important, with a higher threshold and higher requirements for himself.