Considering how many papers I read that still are easily misunderstood even by smart readers... I think "defensive writing" is better understood as "good writing".
Of course papers are expected to be "bulletproof." It's called a standard of excellence. Peer review is supposed to be meaningful, not a rubber stamp. But the sneaky secret is, the bar isn't even that high. I read so many papers where I wonder why an obvious alternative interpretation isn't even mentioned, or an opposing viewpoint isn't cited, or where the author subtly misrepresents another author.
("Capricious people" are a separate subject, but they certainly exist just as much in industry as in academia...)
The rest of the post aside, this particular bit of the "rant" just feels like a defense of lazy writing. An academic paper isn't just a blog post, and it shouldn't be.