I'm most certainly calm, and not sure how you perceived I was upset. I do not want a fully realistic sim. I want a game that is fun to play. If it is setup somewhat realistically, I'm okay with that.
I'm going to trust Bodhi's word, and my own limited knowledge of physics, so assume damage to the prop would be very bad, and modelling a prop with half a blade still rotating, or even staying on the plane would seem to be anything but realistic. I also imagine with the frequency of headon shots, bomber guns, and debris flying, that prop damage, would it be modelled, would become the number 1 killer of aircraft.
Regarding the upsides of prop damage (beyond the groundstrikes and collisions that now damage it), none that I see. Downsides: HO shots, bomber guns, GV pintle and topside guns, field ack, carrier ack, port ack, puffy ack, M16s, debris all causing your prop to fly apart and wreck the front of your plane.
Additionally, aside from making a concession that props flying apart continue to work, I specifically aim for the cockpit whenever I can. If I only damage his prop instead of turning him into meat puree', I'm going to be ticked off.
You're right, there are a lot of things that could be modelled in so much as damage goes, but what would they really add to the game? That's the question I would assume HiTech asks himself when considering these things, as I've seen him cite complex affects on gameplay as reasons for nixing quite a few ideas over the years.