This is endemic to most pedagogy that uses programming, I feel. I often see Learn x via the medium of Python and it feels quite philistinic compared to a proper textbook - maths isn't that hard if taught thoroughly and confidently, don't write a cookbook.

On the other hand, don't write books like engineers do. Treat it like a work of art rather than a legal document - introductory engineering books are too slim, and more advanced texts (especially on FEM, I've found) are almost unreadably dry (If you want to be dry, write like a mathematician and try and motivate things first rather than spewing pages of unproven results that we may or may not need later)