i don't mind the damage model. doesn't seem that often that i get behind someone and don't put enough lead into them that they don't lose parts they need. i don't fly 20mm birds to often, but i find it hard to believe that 4-5 direct hits on a wing from that caliber would not cause at least an aileron to fly off. then again i could be wrong, and i guess packet loss/lag may also play a factor. in the past i've experienced people hammering me with smaller mg rounds, causing not as much damage, then listening to them gripe about it....as if they hit me with all cannon rounds.
too many other things to worry about, if HT, changes focus to damage model, everyone will whine about not working on CT. If they make damage model too sensitive, many will whine about that instead.
At the same time, if you want a more realistic damage model where a few pings may drastically alter your your planes performance, why not also model random mechanical problems with engine and other parts for the sake of realism. Who knows how accurate the modeling for those other games are, besides just pure conjecture.
also, how would damage models affect gameplay. if you can affect planes ability to fly more easily, would people become more timid and only b/z. damage model is important to game, but imho takes a back seat to flight model and considerations as to how it will affect gameplay/fun factor.