Independence in choosing an implementation is never ever going to give you good results at a job where you have to report to someone else.

I have been at those jobs.

Trust me (or not): even if you are given this kind of freedom at first, it comes back to bite. You want to get the person in charge to agree with your design for any project that takes a week or longer. Otherwise, the moment that your solution does not create the expected happiness in the stakeholders, you are in a position to become the scapegoat.

This sounds cynical at first, but it's just reality. Besides, imagine if you were the boss of someone... It would be of immense value to get a specific plan for a large project before it even begins. There is nothing good about the uncertainty of not having a plan.

Remember this: I did not ask for the plan to be given to me, I created the plan and offered it as a proposal. I am the one doing all of the difficult pieces, and serving it on a golden platter to the person in charge.