When you write a library the first step is always designing it. LLMs dont get rid of that step, they get rid of the next step where you implement your design.
Is this really "additional"? do you not do design docs/adrs/rfcs etc and talk about them with your team? do you take any notes or write out your design/plan in some way even for yourself?
If I'm writing a library to work with a binary format, there is very little English in my head required, let alone written English.
That is a heavily symbolic exercise. I will "read" the spec, but I will not pronounce it in literal audible English in my head (I'm a better reader than that.)
I write Haskell tho so maybe I'm biased. I do not have an inner narrative when programming ever.
I’m not part of any team, I work on my projects alone. I rarely write long-form design documents; usually I either just start coding or write very vague notes that only make sense when combined with what’s in my head.