Every dependency your developer chose is now your risk
Every library added to your project outlives the developer who chose it. You inherit its bugs, its licence and its eventual abandonment, whether you agreed to it or not.
When a developer adds a library to your project, they are making a decision that outlives the sprint. You did not review the licence. You did not check who maintains it, or whether they still do. You simply inherited the choice, along with everything that comes after it.
This matters because a modern web application is rarely built from scratch. Most of what runs your site or your product is code written by strangers, published for free and pulled in with a single command. That is not wrong in itself. Reusing well tested code is often the sensible route. The trouble starts when nobody in the room is asking what happens if the library stalls, breaks, or turns out to depend on something else that stalls or breaks.
Who is answerable when a package goes quiet
Open source maintainers owe you nothing. Many packages are the work of one person, done in spare hours, with no obligation to keep patching security holes or supporting new versions of the language. When that person moves on, the package does not announce its own abandonment. It simply stops changing while everything around it keeps moving. Your project then carries a dependency that nobody is watching.
You feel this later, usually at the worst time. A security scanner flags an old version. An update to your framework breaks compatibility with a library three layers deep, one you have never heard of and did not choose. Fixing it means someone has to read code they did not write, understand decisions they did not make, and take responsibility for a choice made months or years earlier by someone else entirely.
Every dependency you accept without asking is a decision you will eventually have to defend.
This is why we treat every addition to a project as a real decision, not a shortcut. Before a library goes into your codebase, we ask whether it is maintained, whether its licence suits your business and whether it does something small enough that we could replace it ourselves if we had to. Sometimes the answer is to write forty lines of code instead of importing a package that would have brought in forty dependencies of its own.
What a fixed price protects you from
A fixed price only works if we control the risks that could blow past it. A codebase stuffed with unexamined dependencies is exactly that kind of risk, because nobody can quote honestly for problems they have not yet discovered. Keeping the dependency list short and deliberate is not a stylistic preference. It is how we keep our estimates honest and your product stable long after launch.
You do not need to know the name of every package inside your application. You do need to know that someone looked at each one and could explain why it is there.