i think your all nuts!! lol the only reason at all to stay on B (at this point..) is if you are stock and want the battery life everyone claims it gives.. zvd was a great update for more reasons than one..
was many 'good additions' to the stock zvd kernel vs. the stock zvb, including homeless kernel-like features for better battery life on D, the only reason people stay on B rooted is because the 'Custom' kernels have the features added which of coarse makes the phone better.. but B itself is not that good..
Updates are made for a reason.. i understand that all phones are made different blah blah blah.. but ZVD all in all is just a better base, performance wise and all.. Plus when was the last time a zvb rom was updated?
mind you this is MY opinion, which i have every right to!!
and sorry for calling you all crazy lol