I have worked in several companies in the industry, and it is not that this does not happen in other companies, but here it is quite obvious that managers are holding back talent and deliberately preventing them from fulfilling their potential.
I don't know what the problem is, maybe they are afraid of employees who are more competent than they are. How many times have you heard of a case where someone was almost invisible here but made huge strides in their career once they moved to a different company? I know of many such cases.