It all comes down to how you organize your code, and how you want to control usage of things, and how much help you require from the compiler to control visibility. Package- private has always been a bit 'odd' because you can create that package in your project if you want to modify something in a library. Internal is stricter in that regard.
If you organize by feature rather than function, package private doesn't help.
If you truly want to hide something, then ideally those things would be in their own module, and internal would suffice. But having a bunch of modules creates it's own overhead.
Personally, I rely on common sense and code review for appropriate usage, especially since I've started organizing by feature rather than function.
So as Karel said, some will say it's a missing feature, and others don't miss it. If not obvious, I fall in the latter group.