Call me cynical if you want, but I think the adoption (& often subsequent fetishization of) staining developers by a photographer tends to happen at about the same point that they start exercising greater control over negative exposure & processing, often along with adopting a bigger format. Thus, claims seem to be often attached to staining developers that may be far in excess of their absolute abilities & have more to do with the adoption of basic process controls etc. That's not to say that they have uses, but they're not some sort of panacea for poor basic technique. I think that people should perhaps start from asking themselves 'what does it do that well controlled D-76/ XTOL at 1+1 or greater dilution cannot?'