WooCommerce has a pretty fantastic admin user interface. There's just enough tabs to only show you the data you need to see and have the rest of the data be easily accessible. If you're just editing one product it should be easy to change something as simple as the “download expiration” field. But what happens if you need to bulk edit products? Could you use the WordPress bulk editor?
The default WordPress bulk editor is great for a handful of products. But what if your company has some sort of policy change? Like one that changes how long all of your links are valid. If that's the case you could easily be editing all of the products in your store. That's where it helps to know a little code and just update the database directly.