I agree if you say biochemical engineering. My former life was in the biosciences and you're right – it's really complex. (Chemical non-bio engineering is not nearly as chaotic.) We know a lot and are learning quickly, but biological systems are still incredibly complicated and mysterious. Feedback cycles, receptors, signal amplification systems, genetic diversity, chemically reactive 3D structures and on and on.That herds me back into the corral, but it seems to confirm my suspicion that chemical "engineering" spends half its time knowing what to expect and the other half measuring substances to find out what happened. That doesn't happen in electronics.
To me electrical stuff seems rather simple by comparison, hence its attraction as a hobby. It's basically just logic puzzles. The workings of my iPhone are as mysterious to me as those of a chipmunk, but I know the phone was designed and built by humans. Every function inside is understood in great detail by somebody, if not me. Not so much for the chipmunk.