One first must love reading, which will then lead to a proficiency in writing, and finally, result in a writing career (for some).
I also have to disagree with this, and most particularly, with the word "must" in both places where it appears. I never liked -- let alone "loved" -- reading, but as anybody familiar with this community over the last decade or so will attest, I've managed to become about as successful doing this as anybody in the recent history of this business. As a student, I detested assigned reading; and even as an adult, I only chose to read for the purpose of learning about specific topics about which I had some interest in knowing more. My reading comprehension and writing ability drew compliments from my teachers since grade school, but they are both largely innate, although the latter is also substantially attributable to having been raised by a father who was a grammarian and whose lessons were then perfectly supplemented by a 10th-Grade English teacher, a master of the language, himself. My own development as a writer completely disproves the proposition that love of reading is a necessity; and I've known plenty of intelligent adults who love to read but who would not even remotely be considered good writers, thereby disproving the other part of that particular argument, although, admittedly, only anecdotally.
Just like any other job, the technical skills of being an academic writer is developed on the job, based on client requirements for specific research and opinion papers.
I agree, but this actually contradicts your earlier statement about the significance of a love of reading
before becoming a working academic writer as a necessary prerequisite to success
as a writer. As I've described in much greater detail elsewhere on this forum, I was as intimidated by writing assignments in college as my clients are today,
despite the fact that my writing was always technically good whenever I was forced to do it. That's one reason that I understand exactly why they need me and why I don't think they should be apologetic or ashamed about needing my services.
When I started doing this for a living roughly 20 years ago, I was already a very good writer, notwithstanding the facts that I rarely read for pleasure and that I was no better at research than any typical college graduate who never wrote anything that hadn't been assigned in school. At first, writing a 10-page essay took me several days and many drafts, just as is the case for most non-professional writers, even though my
writing was actually already very good. It was, in effect, my on-the-job training doing this for a living as an essay-company writer that allowed me to become sufficiently proficient and efficient doing this to be able to write a (good) 10 or 20-page project (or half a dozen short essays) overnight, if necessary, and to produce a high enough volume of writing to earn a decent living doing (only) this.