Our new old home has the bathroom venting to the attic. We are looking correct this somehow.

My father in-law has asked that we buy non-insulated tubing and cut a hole directly above in the roof.

My uncle has suggested that we purchase insulated tubing to prevent condensation. Then route to the exhaust vent, he is expressing concern that cutting additional holes in the roof could through time expose additional problems aka leakage.

What is the most common practice, and what risks are we incurring by adding additional cutouts in the roof?