In my experience, this is because a modern engineering organization is laser focused on delivering value. Value rarely aligns with refactoring an existing, working implementation. If need the data, you build an integration on the output data. If something isn’t working well enough, you fix that one thing, you don’t refactor half the application.

Getting product to prioritize refactoring a working product is like pulling teeth. Even if maintenance is a moderate drain on resources, work beyond maintenance on working solutions isn’t seen as a net win.