For most films, it's passable. For films like John Wick, it wouldn't work - but films like that have more stringent H&S checks in place due to the nature of the choreography.
And as i work in CGI/VFX, spotting fake or poorly done muzzle flash, shell ejection and the like can ruin a film. Like those Sky made action films - they look dreadful (among many other bad things about them).
Edit: Also, after spending time on set with replica and prop firearms - the armorers i've worked with would blow a bollock if they were on that Rust set. It's annoying that 2 people not following the rules cast shade on the whole profession. Imagine if they banned train drivers after a rail accident - hyperbole, yes, but a whole industry and profession shouldn't have to change because 2 people didn't follow standard, strict rules.
2nd edit: Also the knock on effect - VFX ain't cheap. So the budget comes from somewhere. The studio pockets (lol), or the VFX budget. Which means corners get cut, artists get squeezed and underpaid, or it gets outsourced to India. They always saying "fix it in post" when people in post always say "Get it in camera".