This topic will be debated till the end of days. I started out thinking there was perhaps some merit/logic to it but after feeding for a while in a separate tub and now feeding right in their tub I can honestly say there is no difference. I did use to find it easier to take them out and feed them in a separate tub so I could change out their substrate and clean their tub while they were eating. The issue with this was that as I added more and more snakes feeding night was taking hours because of the time involved in cleaning the tubs. Now I use paper substrate and have 8 spare vision tubs already clean and lined with paper and ready to swap out when I see a mess. Monday night it took 10 minutes to feed all 12 snakes I currently have.
I think the key thing is you have to train yourself how to be aware of whether they are in feeding/hunting mode or in explorer mode. Pretty much every time I pull their tub they are right there at the ready so I know to be cautious that they think food is coming. Usually after distracting them for a minute or two I can reach in no problem and I've not been struck at in a long time. Once out and broken from the feeding response and they know you're not there to eat them they chill and hang out with me.