First of all, such works give people a bad feeling from the senses. Although the story is carried out in a realistic way, the age shown in the story is far from the sense of age in the minds of young people now. They don't quite understand the people of that era, and they can't agree with some of the human nature of the protagonist. This gap is one of the reasons why modern people are not interested in works.
Secondly, the writing language of novels is somewhat different from that of the Internet age. Modern young people, who have read most of the literary works of Japan, South Korea and western countries since childhood, have long accepted their way of thinking, but they don't know much about these things that really belong to their own nation on the local land. Although human nature has rarely changed for thousands of years, the expression has changed after all. People who have not experienced that era personally can rarely understand the truth behind such literary works.
Thirdly, I think modern people are always in a busy state, and few people can calm down and read a novel seriously. As a result, novels are ignored, and young people have no good way to take time out to acquire knowledge through reading. They can only solve the problem of lack of knowledge through fragmented reading on the internet, but the effect is not good, and they have not found a real way to help them solve the problem.
Although it seems that young people have been studying, there has never been a system that allows them to acquire knowledge in a relaxed mode, change imperceptibly and become a member of their own national culture.
Sometimes, they are slowly westernizing from their bones, which is the most serious problem. Just as modern people flinch from our ancient prose, it is not impossible for them to understand their own national things one day. What do you think, friends?