I don’t really get spiritualists who think it’s useful to be “detached from the world,” or “detached from their body.”

Why not use my mind to optimize my body, which is a necessary channel through which to express and support my mind?  Why not employ feedback from the world to ensure that my perception is aligned with my internal and external realities?

I understand that artificial delineations can create useful reference points which can inform my strategy, but I don’t understand the usefulness behind designating one thing as definitively “spiritual/unspiritual,” “good/bad,” or some other simplistic label that reduces my ability to clearly perceive the nuance behind phenomena.