This question involves many factors such as the definition of good writing, the characteristics of good writers, and their writing experience. It was common for people who used to be good at writing to be unable to write anymore. Maybe it's because their talent has been discovered but for some reason they no longer have the chance or are unwilling to continue writing. This situation was especially common in novels, poems, and other literary creations. People who were good at writing usually spent a lot of time and energy thinking about and planning the plot, character, and so on. If this time and energy were used to think and create content in other fields, they might lose their enthusiasm for literary creation. Writing also required constant practice and experimentation. If a person kept writing but did not make any progress, they might lose interest in writing. In summary, it was common for people who used to write well to not be able to write now. However, as long as they maintained their passion for writing and continued to learn and try, they still had the opportunity to create excellent literary works.