My concern there is not that a monolithic block of sequential code is inherently spaghetti code. It's that their natural tendency is to spaghettify over time.

My concern there is not that a monolithic block of sequential code is inherently spaghetti code. It's that their natural tendency is to spaghettify over time. Clean 300-line functions form an unstable equilibrium point; it requires constant effort by someone who cares about code hygiene to keep them clean. More so than factored code.