Still, DPICM would be very effective against the entrenched Russian formations arrayed in depth that the Ukrainians are trying to overcome, Shoffner said. Because these munitions cover such a wide area, they also require less precise targeting information than Guided Multiple Launch Rocket Systems.
All of the article. They need to breach the Russian trench system.
Why the US is considering giving Ukraine cluster munitions (taskandpurpose.com)