Makes sense that if you kill Elder Boar with a Simple Dagger, you will be able to extract its tusks, hide and meat and sell it later or use in crafting, but if you casually kill it with a swing of Soulreaper Sword of the Abyss, the boar turns into badly burned lump of minced meat and you get nothing.
That is a good idea. Many government agencies that manage game hunting allow bow hunters longer seasons and relaxed takes, because it's more difficult than rifle hunting. This suggests your idea is backed up by real world examples.
Thanks!