Wait, you said above:
and now you say there's a "preponderance of evidence"? I've been scouring the wiki and questioning discord to find any evidence. Conjecture isn't evidence and testimony is only circumstantial, not to mention biased.
Alright, I'm going to put this to the test. It's much easier to measure the statistical differences when you have larger quantities to compare, and I could do it with epitaph drops but I'd rather not experiment during this event. Between events I plan to farm thunder exchange mats (14-2), and gather results for ores, cores, pixies and cats with and without snatch. 1st day I'll run as many times as I can without snatch, then try to match that with snatch on the 2nd day and make up the difference on the 3rd. Each snatch run, I'll use snatch on the first pixie and each of the cats.
I agree with you on warning beginners to gaming in general; anyone familiar with RPG drop mechanics already knows they're more subject to RNG screwage than any other ability and have come to accept it. If you want a soul whose abilities are unambiguous, any non-gunslinger would fit the description.