Interesting! I praise RSS in my WordPress-powered feed too (also inspired by Kev Quirk), but my approach is different. I have a static message that I can override using post metadata, so I can customise it specific to the post content!

But I don't do that often, so I might set up an array of options too. But if I do, I'll probably use b the modulus of the post ID to select the message instead of a random number. That way, the message for a given post remains consistent.