No one ever said not to assist, people say it should be done as a last resort and last resort only.
Sadly over the years the majority of the people coming to forums wanting to assist a snake that is not eating want to do it even though if the animal is not a good candidate for assist feeding.
People coming here wanting to assist 1000 grams females, hatchlings because he will not eat f/t or a BP house with improper husbandry should not assist their snakes but look for the solution that will get their snake back on tract first.
Sadly I have seen my share of new owner thinking they have tried everything and rather than listen to suggestions would rather assist an animal that does not need it.
Do some need to be assisted absolutely but again only when everything else has failed.