I think storage box mechanics doesn't discard drop mechanics. I have possibily to drop items and keeping them in the storage boxes in other survival games like TLD or Don't Starve. If you have possibility to drop loot on the cabin floor - you don't need storage box but without it your cabin will be a complete mess. It's just a more comfortable and logical way to play. At this moment I would put discard mechanics to "minus" column. Of course survival game shouldn't be nice and comfortable but you should make it harder other way - by adding a Thirst for example.