Just a heads up that the popular OER publisher out of Rice university, OpenStax, is offering a writing textbook for the first time:
https://openstax.org/details/books/writing-guide. It includes readings from many diverse authors as well as profiles of writers like bell hooks , Atul Gawande, Samin Nosrat, and Michiko Kakatani. See "Meet Dr. Michelle Bachelor Robinson, author of Writing Guide with Handbook" for a bit on the philosophy:
http://disq.us/t/452y3kc
Curious if anyone is trying it or considering it?
Anna Mills