I think it depends on who you are asking. Honestly some people dont care about handling the animal, as long as it eats and sheds and poops, without any complicated setup and no late night internet research, then thats a beginner animal. Other keepers who generally care about thier investment, want to know everything about the animal and its requirements and after a few months of successful bp keeping beleive its a beginner snake, get more bp's, and move on to keeping other "tougher" species. So this question is hard to answer, some people do think bp's are tough to keep and some dont.
I read this whole thread and i dont think you will get the answer your looking for. I hope this makes sense.