So it still requires someone to be annoyed - the only change is that you would explicitly say that it can be staff or passenger.
No, it requires someone to hear it, e.g. the guard walking through. The "annoyance" bit is a higher bar and effectively requires a passenger to complain and state their annoyance, which could result in them receiving abuse once the member of staff went away and thus being reluctant to complain even though they are annoyed.
I think the point being made is that Zoom meetings are rarely entertaining.
Well, there is that Handforth Parish Council one
I think the wording is a little moot, though. It's clear what we want to ban (using electronic devices without headphones or having the volume on headphones so loud that others can hear), and what we don't (the occasional ringtone for a short time or the barely-audible other side of a phone conversation), so I'm sure a lawyer can write a suitable law for that. The problem is the "annoyance" bit, which basically requires a complaint to be made. It's essentially about dealing with rude, inconsiderate people who think it's OK to do stuff like watch films out loud or have phone conversations on speaker, but ensuring that people don't have to single themselves out for potential abuse by the perpetrator by making a complaint to deal with it.