(1) Proskurov is now called Khmelnitsky. Mikhalpol is now called Mikhalovka.
(2) My estimates of earliest dates where often based on the style of gravestone, not necessarily from observable dates (not always available). The style of the gravestones was quite distinctive within different time periods.
(3) My above scale is purely subjective. It should be noted that the older cemeteries have significant natural degradation. This is strictly a function of the quality of the stonework, the composition of the stones, and the weathering conditions of the site. For instance, in the old cemetery at Medzhibozh while perhaps only a few hundred stones are visible, you get the impression that every square inch at one time had a stone over it. As you walk, underfoot you can feel stones or portions of them. I feel this is mostly an erosion effect and not an effect of vandalism in this particular cemetery. The surviving stones generally are quite massive with significantly deep carvings. Frost heave over many freeze-thaw cycles has a significant effect on whether the stones remain in their original upright positions. Generally, those gravestones with the upright parts that are firmly connected to a basal foundation tend to stay in their original positions. Others tend to topple over then subsequently get buried by soil and vegetation. It would be interesting and perhaps worthwhile to attempt to restore some of these cemeteries. This would primarily be an exercise in archeology, IMHO.