(This is definitely an older post for me, so I've had some more thoughts since publishing)
I think the idea is that every good engineer should know what they dont know.
And, on the contrary, I think a frontend JS dev should know about message brokers, often used in delayed writes (conceptually), otherwise when they post back to the server, and the page refreshes, they might be very confused as to why the content doesn't reflect the recent addition! :D
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