I don't know precisely when I stopped writing first drafts, but I do know I haven't written a first draft in years.
When I started writing as a teenager in the 1970s, I drafted everything on a typewriter. First drafts were horrendous, messy stacks of paper that I wrote all over, cut apart, and taped back together. Second drafts--typed from the Frankenstein's monster that the first draft had become--were much like the first, but not quite so messy.
Each subsequent draft was retyped until I felt I had a submittable manuscript.
I worked much the same way even after acquiring my first personal computer and word processing software. After writing the first draft, I printed a hardcopy and treated it exactly as I had a typewritten first draft, only I didn't have to retype everything.
Decades have passed since I first used a personal computer and a word processing program, and I find that I no longer produce "first drafts." I produce "full drafts."
I write and revise on screen as I work through a story so that by the time I print a hardcopy no revision--or no significant revision--is usually necessary.
I read all or part of the story aloud, listening for rhythm. I look for sound-alike or sound-similar words that I may have misused ("insure" vs. "ensure," for example). I double-check that the blonde on page two isn't a brunette on page seven. By the time I've worked through a typical short story I've marked a half dozen or a dozen things for correction.
I have my final draft once I make those changes to the computer file, and the final draft is then submitted to an editor.
Do I sometimes have a story that requires a second "full draft" or even a third before I have a final draft? Occasionally, yes.
But I haven't produce a true first draft in years.