I would argue that the physical sciences do not address purpose. Even an MRI (or PET scan) only addresses mechanism, not purpose.
Yet an MRI scan is done for a purpose.
If I go to the store to purchase some eggs, then I went to the store for a purpose.
"Purpose" by itself is not a problem. It is how we use that term. We need to distinguish between local or short term purposes, say an bird catching a fish for the purpose of feeding itself, and a long term or ultimate purpose (why birds exist in the first place). Biologists tend to prefer the term "teleonomy" for such local or short term purposes, and they try to avoid using teleology which would presumably be applicable to ultimate purposes. It would be difficult to discuss biology without "teleonomy."
Jesus was a liberal hippie