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Linear code is more readable
(blog.separateconcerns.com)
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At a certain point this is necessary due to overall length. You don't want a single function that is hundreds of lines long - they suck to debug and to test. Single-use functions break that up into logical chunks that make it easier to understand.
This can actually be ideal in many cases due to the Single-responsibility Principle. Think of the purpose of those functions as coordinating the workflow of the other functions.