I don't think you really need to burn their feet, I mean, you're obviously going to get a lidded bin so you don't have to deal with the smell. Burning their vocal chords on the other hand...
you need to burn their feet, cause otherwise theyre gonna start junping and turn over the case, and then you have to clean rotting garbage while hearing stinky Yukkuri brag about their achievement.
even if the lid is hermetic closed, you need to burn their feet because... you need to burn their feet.