You generally got it. ;) The grey areas keep things interesting. Methodology is also important to consider and pick apart more and more considerations of appropriate applications and working contexts. It may be that this practice should be re-categorised rhetorically too, e.g. the language that we use to talk about this subject causes too much confusion as this thread exemplifies.
Lots of things have once been seen as mystical woo, but later had some of the phenomena established with good investigations. From what I have seen, and I’m by no means an expert, that body of literature one would expect for this just isn’t there yet.
Ps: Determining a good IF score will depend on the niche-ness and topic as well but that is why you try not to examine literature in a vacuum of one or two papers. Naturally, those that read more on these specific subjects are the best judges.