can't those with excessive amounts of power(an unladen UH60, for example), power themselves out of VR?
No, because power is actually a factor causing the problem. In the vortex ring state, the helicopter is trapped in a recirulation of its own wake. The more power you apply, the faster the recirulation goes and the faster you sink.
However, the point many people seem to miss here is that the vortex ring does not only consist of a downdraft, but also an updraft and the core idea of the Vuichard recovery technique is to use the updraft to get out of the vortex as quickly as possible.
It this wouldn't work, then Tim Tucker wouldn't have put it in the Robinson Flight Training guide.
If it ain't broke... don't try & fix it
Well, it is "broke" as long as we see unnecessary VRS accidents happen, the latest just being the Rega A109 crash last month.