It helps with reasoning in some sense, and the net balance might be positive in how much reasoning it enables, but it definitely hurts local reasoning. You need

It helps with reasoning in some sense, and the net balance might be positive in how much reasoning it enables, but it definitely hurts local reasoning. You need broader context to be able to analyze whether the function is correct (or even what it's supposed to be doing if you don't actively work to prevent entropic decay as the codebase changes). You can't test that function without bringing in that outer context. It (often) doesn't naturally compose well with other functions.