I got my start debating on dialup bulletin boards in the late 80s and early 90s. In effect, constantly debating caused me to evolve a rhetorically effective writing style. It also, at least because I’m not self-deceptive and avoid cognative biases, forced me to refine my ideas, moving ever close to what is true, not simply what I already believe or simply wish to.
Therefore, one of my best writing processes is to accost a board like this one and get into debates. My writing style in a column where I want to convince people is actually completely different from when I am seeking to refine my ideas by forcing them to compete with others. In the latter case, I state things very strongly, sometimes going out of my way to assert points without supplying support, in order to draw out criticism and get the discussion moving. There’s nothing that’ll kill a new discussion faster than presenting all of the proof so that nobody feels they can rebut what you claim.
Note that I don’t really expect to convince my opponents in those debates. Confrontational tone rarely does this, although you can convince some of the other 99% of readers who never post.
If I have a new issue I want to address, I go out and get into debates with adamant, hopefully intelligent opponents until my article actually writes itself, in what is left over as my core defense that the badguys can’t seem to get past.
For example, on here yesterday I stumbled upon what seems to be the irrefutable proof that fractional reserve banking is not fraud:
Any fractional reserve bank can simply print on each certificate “this is redeemable for its value in gold, pending supply: we keep 10% of our notes, in gold, as reserves”. This illustrates what is already true: That everyone knows it’s not a literal gold warehouse already, ergo it’s not fraud.
Nobody has even TRIED to refute that. I think it’s simply insurmountable.
My actual writing process can therefore just be a matter of nicely formatting the tightest set of arguments I’ve come up with in debates, putting them into a more neutral tone.
If I haven’t debated out an article’s structure, what works best for me is exactly what you say; I throw up (pun intended) some rough idea and then rewrite/edit it repeatedly, until it’s tight and pretty.