Hi,
Well I think I know what they mean.
When you change anything in a snakes routine it can cause unexpected problems. How many times have we told people that adding new (but better ) hides to the tank can mean the snake needs time to settle back down?
It's not impossible that a snake that is used to being placed in a feeding enclosure on a regular basis to be fed would be uncertain when the routine was suddenly changed.
If you think about it we rely quite heavily on conditioned responses in feeding.
That's why we emphasis keeping the routine and offering in the same way the snake is used to.
I know from personal experience when I stopped feeding one of my snakes in a separate container she didn't eat for the first three or four times and seemed really nervous about the whole procedure.
But once she got used to the new routine she ate happily and has been a bucket for the most part ever since.
In the end it all comes down to the individual snake and how skittish it is - and that is something that everyone needs to learn about their own animal.
It should, broadly speaking, be fine to feed inside the enclosure but animals aren't perfectly predictable.
dr del