With the current mix of recipes and rock products, I have had a very hard time figuring out what to do with red elements. Green, blue, and shiny seem reasonably well balanced but I keep piling up red.
After destroying rather a lot of red, I bought a second pouch. I quickly filled the second pouch with 5k red and then found that I was destroying elements again despite only having one slot filled in element pouch 2.
While previously there were issues in ensuring overage didn't destroy other elements, overflowing into an empty slot should be enabled.