Just 'cos you can't say there's a direct parallel between, say an trad aussie interpretation of CnRs, and ones in europe, doesn't mean that there's no point in gathering the info and doing a bit of meta-analysis, just on the off chance there's something to be learned. But that seems to be the way things are. E.g. "Oh, you just can't compare the diferent cultures across time and space, they aren't related."