It looks like you're misquoting GP. Unless they edited it later and I didn't notice... the commenter said, "_seems_ superflous" not "_are_ superfluous". They said they were willing to be educated on what those roles did.
Don't share if you know (and admit) that you have no idea what you are talking about. If all you want to do is learn, ask. Nobody is interested in ignorant assumptions.
Also you might take offense in my interpretation of what has been written but I did not misquote anything.
Yes, I'm aware of the rhetorical technique of the "question that's actually a veiled insult". E.g. "Why does Facebook/Airbnb/Dropbox have all those thousands of programmers?!? What do they all do?!?" ... are often not really sincere questions but really a humblebrag of commenter saying, "I can code a Facebook clone over the weekend with one hand tied behind my back...yada yada yada"
I hope my example above shows the we both have a shared understanding of unstated but implied messages in what people write. That said, I still think it's a more productive discussion to try to answer the question the way pjc50 did[1] rather than the retaliatory criticism of your reply.
>Nobody is interested in ignorant assumptions.
Well, those "ignorant assumptions" was (for several hours) the top-voted comment in this thread so it seems that many are interested in it. (I'm using "seems" in a sincere way.)
If you think it's unproductive to try to answer the commenter's question because you believe they were only trolling Mozilla, consider reframing it as "educating all the lurkers who upvoted that comment". The silent lurkers may have sincere curiosity about what all those roles actually do even if the commenter you responded to does not.