Yeah cat there are two schools to be sure. A fair amount of people struggle with it. I laugh when I hear that a BB30 bike is returned to a bike shop repeatedly and can't be made quiet. Two bores, two bearings, loctite and a crank with a lateral spring aka wave washer. Now that's complicated...lol. A BB30 can't make noise if properly set up. Two of the bikes shops in my town can't adjust a derailleur let alone understand the nuances of BB30 or PF30...or the difference the crank makes in set up. Also Campy UT + BB30 or PF30 is a bad match although Campy sells cups to convert them...but still not a good design mix.

One way of looking at is...if an owner can't set up his BB30 to be quiet than he deserves to live with the noise or buy a lesser frameset with a threaded BB. Look at it as a litmus test or discriminator of sorts that will keep the worlds apart. That way guys who like BB30 can ride and appreciate them and guys who can't set them up to be quiet can live with their threaded BB and heavier crank. I agree that the weight and stiffness difference doesn't mean much at all. I will also add, I still like a threaded BB. I just don't hate on BB30 or PF30 as some do.