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Pretty much.
You can see their logic though, it only takes something to go minorly wrong taking a bb30 out and you're not in a good place, the metal on the carbon means that if something has to give it'll be the latter. The vinyl/plastic cups give a bigger margin for error, interestingly though Trek's bb90 seems to have a much better reputation against creaking.
noBlakes-
The vinyl/plastic cups give a bigger margin for error, interestingly though Trek's bb90 seems to have a much better reputation against creaking.
I'd wager a big chunk of this is because there's simply less BB90 in circulation, whereas BB30 has been around since what...the CAAD6 in 2002? And was licensed as an open standard that anyone could implement.
Howard
Because the bb86/90 or whatever standard doesn't have tight enough tolerances for them to make them out of metal?