Flash Loans Are Troublesome, But Also the Most Magical DeFi Building Block

In my view, flash loans are the most magical building block in the DeFi Lego. However, because they are often associated with hacker attacks and there aren't yet enough applications based on them, the full appeal of flash loans has not been revealed. So I tried to write this article, hoping to abstract some possible meanings of flash loans starting from small use cases. However, rising to the level of significance may seem like overreaching. Please take this article only as a personal perspective and viewpoint.