That’s not the case the parent was asking about though. They were asking whether they can do more than what’s in their job description. Not whether someone else is obliged to do more.

I don’t doubt your experience and it’s totally fine by me. That’s how they want to run their workplace, that’s the way they run it. It doesn’t mean you’re gonna make yours like that. It’s unlikely that a software org would be run like that. At the end of the day unions are democratic institutions where their members decide how to do these things. Because of that, your current org would likely be run the way you and your colleagues want to run it. Not in some bizarre way that Las Vegas convention workers do. :D