Usually the people for it are people with limited experience, the people against it are the one with more experience.
Facts
With a species like BP moving to a secondary enclosure is brought to lead them to food refusal.
Moving a snake in feed mode which happen hours before and after feeding will get you tagged sooner or later.
If you have a strong routine they know when feeding day is even when fed in there enclosure.
They can digest fur, bone, teeth, nails so a little substrate is nothing.
They will not mistake you for food if you feed in the enclosure, holdest myth I out there.
Bottom line keep it simple there is absolutely no reasoning behind feeding in another enclosure for BP
I feed hundreds of them in their enclosure which has either aspen or coco coir.