Every product starts by depending on open source it doesn’t fully understand. That’s fine. It’s the whole point. You stand on the shoulders of people who solved problems you haven’t even encountered yet, and you ship. The dependency is invisible because it works.

Then the product grows, and you start noticing the edges. The upstream project makes choices you wouldn’t have made. The schema carries fields you don’t use. The routing engine takes a turn you can’t explain. The update process becomes a gamble: bump to the latest version and hope nothing changed in a way that breaks your use case. You’re accountable to your customers for software you treat as a black box.