Actually, it does, because there's two different issues as most everyone keeps missing:
Signal attenuation (degrading the signal, losing bars, etc) = holding it the hand, period.
Signal and service interruption (losing signal, losing bars, losing service totally) = bridging the seam between the two antennas.
Similar, but two different and very reproducible effects for many people. Simply holding the phone in the hand does one thing, one level of attenuation, while holding it and making contact on that seam with the hand or using a fingertip alone can and will cause some serious crap to happen, for those of us experiencing the problems.