People with large collections don't have separate feeding enclosures because it's too much of a PITA moving dozens if not hundreds of snakes into separate tubs, and then moving them all back hours later.
People with large constrictors don't have separate feeding enclosures because they don't want to end up bleeding like a stuck pig after wrestling with a foody adult reticulated or burmese python.
People with venomous snakes don't have separate feeding enclosures because they don't want to end up in the ER or on life support after taking a hit from a foody viper.
So, if keepers with a lot more snakes, a lot bigger snakes, a lot more dangerous snakes, and a lot more snake experience than most people on this board, including me, you, and your fiance have, feed their snakes in their enclosures, can your fiance explain why it's a good idea to feed in a separate tub?