It's true, some of our guys like to hear themselves talk and regurgitate the same stuff the CA said at the gate. While DH I've heard pre takeoff announcements that included route, weather at the destination, and yes, the kind of airplane taking off in front of us and a quick explanation of wake turbulence (once). Honestly nobody cares and it usually just interrupts people from their magazines, kindles, books, etc. Plus, what a lot of people don't realize is that they just got done hearing the FA ramble on the PA for 10 minutes about all sorts of crap.