Have you ever been frustrated by getting Salyut Grenades from lootboxes, which you're never using? Are you primarily using Mortars and find it annoying that you can only buy discounted Bombs each day? Are you downright scared to unlock new Grenades out of fear that they'll bloat the container loot pool? If yes, then I have two solutions that aim to solve these Problems: Either have Grenades be an universal resource, a shared pool which any grenade uses. Special and expensive Grenades like the Tsar could either be excluded or cost more, like 5 Grenades for example. Or allow exchanging Grenades for different ones. Trade your 10 Medics for 5 Bombs, or pay for example 200 crystals for every grenade you exchange. Cheaper than buying new Grenades and saves you from having an unwanted stockpile of stuff you don't even want.