Shrapnel-creating explosives is used for open ground. In closed-in terrain, blast explosives is always going to be more effective. That’s why the infamous “potato masher” grenade of the Germans was blast-only - it’s far more effective at killing people inside trenches and bunkers. The US used the WW1-vintage Mk.3 grenade for that same purpose up until very recently.
Shrapnel-creating explosives is used for open ground. In closed-in terrain, blast explosives is always going to be more effective. That’s why the infamous “potato masher” grenade of the Germans was blast-only - it’s far more effective at killing people inside trenches and bunkers. The US used the WW1-vintage Mk.3 grenade for that same purpose up until very recently.