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@deleted
I'd have to disagree hear slightly. Although I may take slight umbrage at 'can't be arsed' as a turn of phrase, you are essentially right that preparing the shell for BB30 is a task too far for most frame builders. I have milling machine, but it has a small amount of slop along the x axis, even with the lock out engaged, and having countered any lash back from the threads. It is unnoticeable to the eye, but enough to make it useless for BB30 (and other high precision work, fortunately I don't do much of that, and it will also be a good excuse for a bridgeport at some point). PF30 can be reamed with a Park head tool reamer and 791 attachment. So far, I have just confirmed your assertion, but for me the main issue with BB30 is that if you allow your BB to develop play, and then continue to ride on it, you can damage the frame itself due to the rocking forces placed on the bearings, and if you do that, you can just bin the frame (or possibly ream out to PF30 standard, dependent on amount of material left over. With PF30 you have a softer material than the frame in contact with the frame, so if anything is going to get FUBAR'ed, hopefully it will be the bearing cup.
This is obviously only an issue if the rider is a moron and rides with a fucked BB. As around 95% (being generous) of the population of the world are morons however, that makes for a good argument for PF30.
You may now explain to me why I am wrong.