I've been trying it out for the last week. I have my own opinions, but I'd like to hear others and see if we have common ideas on what is good/bad/indifferent about the Lemmy ecosystem.
A "reply guy" (wikipedia) is someone who responds to posts/comments in an annoying (usually smug/condescending) way, like what you think of when you think of a "redditor". Big platforms like Reddit like reply-guys because they generate engagement (often someone telling the reply-guy to f-off) it's also not a behavior that an algorithm can recognize, so human mods/admins are needed to curb it.
Over time, if Reply-guys are not banned they tend to make the overall ecosystem too exhausting to participate in, and (authentic, desireable) engagement declines.