I agree... I think disc locks and alarms are silly on bikes anyway... When's the last time you heard someone's car alarm going off and didn't even bother to look? Like 500 times in the past year for me. Disc locks... You think someone's going to piss around for 5 minutes trying to hotwire your bike and ride away with it? Nope, the guy and his 3 buddies are going to grab the thing, toss it in the back of a truck, and get the fluck out of there...
Bottom line... if someone wants your bike, they will get it.