As for 'feeding doesn't have to be complicated', I sort of agree, but will point out that many species we keep have not evolved to feed on Mus musculus or Rattus norvegicus. BPs (I just learned; research to make a point here) can be pretty heavy bird eaters, especially when young (https://www.tandfonline.com/doi/abs/...50009809386744).
As for 'healthy animals eventually eating' that simply isn't true, mostly because of the limited and unnatural captive prey offerings (though I think in part because of the unnatural environment generally). I sometimes (less than regularly, but more often than I'd like) have hatchling snakes that simply won't accept a reasonable captive diet, and they starve or get euthanized. I currently have about a half dozen hatchlings that need their food boiled or brained, and are showing no signs of change in preferences. The hoops I jumped through to get them even this far were considerable, and I had two losses this season from complete non-feeders.
Once snakes get out of the hands of the breeder, the poor- and non-feeders among them have been (hopefully) weeded out, so a sample that only considers those established animals isn't representative. I don't think many keepers know what trials go on behind the scenes with some of these species, both in getting them feeding and otherwise (birth defects, health issues, behavioral issues).
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