Yes, unfortunately this feature can't roll back bad mergers. But it can help hugely by turning back the clock on badly edited bio's (in my case there was a period when arborists rampaged through the biographies destroying 'evidence' - valid sources that they did not recognize on face value because they come from a different culture) and it takes me about an hour per biography just to piece it together again so that I can see who did what when and where. If one does not methodically approach the validation of profiles (in an academic sense), it just becomes an unvalidated anarchic mess. The project I'm part of will take a few years just to get the LN'sAB validated with uploaded and properly sourced documents, until that time messing about in the bio's is the last thing needed; it does'nt add, it diminishes. Luckily this stopped largely around end of May beginning of June I believe. But I stilll come across badly mutilated bio's, and this feature helps (on the changes tab - just click on any change and a text pops up) ...
