You wouldn’t give me a free pass to control an aspect of your life. Not unless you had a way to understand what was going on. You would want a means for us to measure what success meant. You would want a way to see what I was controlling and know that I wasn’t slacking off. Even if I am controlling a part of your life (for example, your finances), you still want to have a way to control me.
Project Management is a structured way of knowing and controlling what is happening in an aspect of your company without having to manage every little detail.
Try this: Can I manage your career? Let me do whatever I want, and I’ll let you know when I am successful.
Or this: Can I manage the development project? Let me do whatever I want, and I’ll let you know when I am successful.
The first request seems ludicrous. The second request is regularly made, and granted, from any random department within your organization.
You need project management because the change that projects make must be controlled and monitored. You shouldn’t micromanage each task, but you should be able to talk to your project manager and know that the project is benefiting you and your organization.