I'm not really sure what your criticism is, to be honest. I'll just microanalyze my comment and hope it ends up responding to your point. The passage I posted

I'm not really sure what your criticism is, to be honest. I'll just microanalyze my comment and hope it ends up responding to your point. The passage I posted is basically just, "X is limited, adding more people will lead to X shortages, let's find a way to use X more efficiently", with X replied with water. The implication of me saying this is that you can also replace X with land. Obviously, I could have just said "let's just build more housing, then immigration won't lead to housing shortages", but I think that's a less interesting comment. By instead using the passage, I've done 2 things: pointed out that other people have thought about this issue (in another domain), and encouraged a few people to look up Dune, and maybe read it. Would your criticism apply if my comment instead said "let's just build more housing, then immigration won't lead to housing shortages"? Because I think that form has equivalent content (in terms of the underlying message), so if it doesn't apply that form, I don't think it applies to the current form either.