You are correct in that people moving over from Reddit are accustomed to using the platform as an entertainment provider and not as an RSS aggregator. Memes are entertaining to most, so you can expect them to rise naturally. Reddit uses that specifically to attract/retain people, and most of us have gotten used to it over the years; I personally enjoy it, even.
However, this doesn’t mean you can’t use Lemmy as an RSS aggregator anymore. But we would need extra features for that, such as tags, so you can filter content out based on them. If tags existed, you could trivially filter the “meme” tag out, and it would then be up to moderators (and their bots, and the users, to report content) to make people in a community actually tag their content properly.
I agree with all of this, except the first point, and that’s the reason I’m leaving a comment rather than a vote:
“Refugees” aren’t people who “do not like the app”. I agree that the term is poorly chosen, and offensive to actual refugees who had to leave their lives, home, and a good part of their identity behind, because of a traumatic, catastrophic event; and that “explat” (for “ex-platform”, a play on words with “expatriates”) would be a more fitting term, but the “explat” actually came over because they have never liked the app, except now, it is forced onto them. Moving over isn’t a choice for many, the choice is actually between “not using any reddit-like service at all anymore” or “using what exists aside from reddit”. And in that context, I think you can clearly see why the “refugee” term came to mind (of privileged people who failed to see the humanitarian implications and the belittling of dramatic experiences and suffering of others).