I tend to agree but also see the other side of it in the corporation that I work for. There are a lot of stupid tasks that need to be done that are best handled by someone in middle management as it doesn’t take the managed employees away from the actual work and is something that needs to be done even if it outside the scope of our actual work.
Where I am, it’s selfishness, backstabbing, and politics that are the biggest hinderence from middle managers. Without being specific, you might have someone proposing an idea that, when implemented, will sound good on paper and make them look good while actually causing our work to be completed more slowly. Additionally, you have other people who have the answers to specific problems we face as employees, but they don’t want to share it because they won’t get credit and a promotion for it.