like think of it this way
start out with six bombs, use two for zoning.
then say you want your next item. it'll take a minimum of two moves before you can even summon your next item. throwing away 3 bombs, throwing away your one last bomb, THEN finally summoning your next item.
with the new number of bombs, it'll be like every other item in that if you don't want it anymore, one 214D will get rid of it. this will prove important for CSE plat since she's going to be a lot more item-dependent, and switching out items to keep your opponent guessing will probably be a large aspect of her gameplay.