Have you ever tried to read a math textbook that cherishes being short and concise? They’re nigh unreadable unless you already know everything in them.
That’s not entirely true—Melrose’s book on Geometric Scattering Theory, Serre’s book on Lie Groups and Algebras, Spivak’s book on Calculus on Manifolds, and so on.
I think the phenomena you’re pointing to is closer to the observation that the traits that make one a good mathematician are mostly orthogonal to the traits that make one a good writer.
That’s not entirely true—Melrose’s book on Geometric Scattering Theory, Serre’s book on Lie Groups and Algebras, Spivak’s book on Calculus on Manifolds, and so on.
I think the phenomena you’re pointing to is closer to the observation that the traits that make one a good mathematician are mostly orthogonal to the traits that make one a good writer.