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The second one sounds like it could really screw things up on a smartphone, especially since the original kernel isn't coded to deal with it.
Main reason this isn't available for the Bionic, however, is that the development of the RAZR method was done on the GSM version. The GSM RAZR and the CDMA/LTE version use different kernels, so it's not a plug-and-play replacement. People who HAVE tried it on the CDMA/LTE version haven't had much (if any) success, from what I understand.