Yeah, it's not stupid for strength reasons, more stiffness/lightness/costness ratio. Carbon cranks and stems cost a lot, aren't much (if at all) stiffer or lighter than aluminium ones, and require bonded thread inserts, which, in my experience, sometimes come loose. If anything on my bike is going to be held together by glue, I'd prefer if it was one of my bodges.
Yeah, it's not stupid for strength reasons, more stiffness/lightness/costness ratio. Carbon cranks and stems cost a lot, aren't much (if at all) stiffer or lighter than aluminium ones, and require bonded thread inserts, which, in my experience, sometimes come loose. If anything on my bike is going to be held together by glue, I'd prefer if it was one of my bodges.