> the rhythm of writing has to match the ideas in it
It's hard for me to tell what the point of the author was from just the part you quoted, but why does this have to be the case? I don't have trouble believing that many complex ideas require complex language to describe them, but the idea that it's literally a requirement in order for the writing to be "good" rather than just a usual circumstance isn't obvious to me. If anything, the complexity of this quote just seems to hide the dubious premise.
From the essay’s context, I take it to mean “is benefitted by” rather than “must absolutely”. Maybe my world view is distorted by Zinsser but I see this as an authorism.
A writer can choose to trade off vigor for nuance by hedging. They can preempt arguments with “it is my opinion that” and “one ought to”. But, it is my opinion that, exhaustive disclaimers are not fun to read. I know it’s his opinion — this is posted to his Internet Blog, not a textbook.
It's hard for me to tell what the point of the author was from just the part you quoted, but why does this have to be the case? I don't have trouble believing that many complex ideas require complex language to describe them, but the idea that it's literally a requirement in order for the writing to be "good" rather than just a usual circumstance isn't obvious to me. If anything, the complexity of this quote just seems to hide the dubious premise.