Why did ancient warlocks practice pills one by one?

In fact, most of the medicines made by warlocks are powders and pastes (compound crystals). Reading the ancient records about alchemy, we can see such a detail. When medicine comes out of the furnace, magicians usually scrape it off the bottom or cover of the blast furnace with tools such as knives. This kind of thing is not easy to carry, and it is more convenient to carry and take it when it is kneaded into pills.