What makes it difficult for companies to recruit middle managers?

"But later it was discovered that these employees who were promoted from the grassroots to middle management positions lacked the corresponding knowledge and skills", "They were first placed in grassroots management positions in preparation for being promoted to middle managers after training, but after two By the middle of the year, all of these people had left the company. “These two points are a good illustration of the problem: the problem is at the grassroots level. It is impossible for people who have been trained at the grassroots level where there is a good learning and promotion atmosphere and good system management to not have learned how to manage. Even if you have not received management training, there are management models and grassroots managers as benchmarks to learn from. The latter point expresses the problem more clearly: a bottom-level management culture that is simple, mechanical, and perhaps even grossly inhumane makes people disillusioned and ultimately leave. Obviously, it has become a top priority to establish a clear, clear, responsibilities-divided, harmonious grass-roots rules and management system and a healthy culture. Otherwise, enterprises will begin to degrade and will be a problem they will face in the future.