You do NOT point any firearm at a person and pull the trigger unless you intend to kill them.
Literally no one has said otherwise. The issue is obviously a a failure upstream, so what is with the imaginary gatekeeping?
So me an exception in filming and I’m happy to listen.
Perhaps, because I’d expect the cinematographer is behind the camera, not being part of the scene being filmed, perhaps because I’m guessing directors, who aren’t actors, aren’t in the scene.
Already explained sufficiently —in a few postings— up thread. Did you not take the time to read those?
It depends on the size of the studio/organization. The folks I know in the industry routinely complain about how it's still an issue - they want to hire so-and-so but someone upstairs magically produces a friend's kid or a famous person's 'favorite' for that position, and presto.
People complain about things in every industry, so it is hard to get a good barometer on that. IME, at the larger houses I have worked, HR guidelines are followed pretty closely on these matters and as well, Union/Guild guidelines also seem to matter more than anything else. Make enemies there and it does not matter who your father is.
Really most of what I have actually seen that would qualify as true nepotism is more in securing things like good Agents/Managers. Those indeed are largely unregulated in such things.