Part of the problem is that the submunitions will include pyrotechnic rounds which will cause fire, smoke, and confusion.
Here’s what can happen when one of our own rockets misfires, let alone an enemy engagement:
http://ipmsstockholm.org/magazine/2003/02/images_deck_landings/u124794.jpg
“Learn or Burn Baby! Learn or Burn!”
Seen that film so many times it is engrained in the membrane...