old wives tale my friend.
i'd say any halfway competent photog shd be able to shoot at 1/50 or slower at 105mm with proper handling of the camera.
even 1/6 is possible.
how? shoot more at one go la! increase chances of getting a decent shot. of course tt's only for static objects but whatever the focal length, slow shutter will cause moving objects to blur.
even with VR, at slow shutter speeds i will ensure that i get more shots, then delete the obviosly blur shots on camera, select again on the PC