First of all, jackhammers are very hard to control. Imagine a bullet tip acting in a similar manner, its main vector of force constantly making microscopic changes in direction. This will impede it's penetrative ability, due to energy loss caused by the increased amounts of friction.
And as for swords, read up on blade harmonics to understands why vibroswords (a mace, for example, due to relying on high inertia and applying as much energy transfer as possible, would only benefit from this) suck balls.
IMHO, vibroweapons are much less subtle in application that they seem, more fit for brutal maiming, distruption and rending than clear cuts and neat holes.
And as for swords, read up on blade harmonics to understands why vibroswords (a mace, for example, due to relying on high inertia and applying as much energy transfer as possible, would only benefit from this) suck balls.
IMHO, vibroweapons are much less subtle in application that they seem, more fit for brutal maiming, distruption and rending than clear cuts and neat holes.