I agree with that article, though I'd argue John Wick is the worst example to use as proof it can be done in other ways sure, they've got a lot of guns firing, but first is it's super fast paced, so you can't actually see a single shot. Second is that with that many rounds firing they probably wouldn't have a choice, at least for interior scenes. Taking into account multiple takes, that would be so much gunpowder going off that you'd probably have to take a lot of time between takes for the smoke to clear.

For a slow scene with only one or a few rounds fired close to the camera, perspective tricks probably wouldn't work, and CGI likely wouldn't look as realistic either. Is that a good enough reason? I don't know. I'm not a director or actor. I know some directors will go through a ton of effort for a tiny amount of added authenticity. John Wick goes the opposite direction with all their gun-magic after the first movie.