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>How often are you passing around data that you don't fully understand?

Like all the time. As a program grows, the full extend of what is passed where, explodes.

>Also, people use types and then end up reaching for reflection to perform pattern matching

As a tool in their disposal, with the default being the opposite.

> How often are you passing around data that you don't fully understand?

When you're using the new code your colleague just committed after a week of intense work, for example.

Most people don't reach for reflection to pattern match on types, because when a type _changes_ you get very nice errors at all places where you've just introduced a bug.