> If it's not actually re-used then it's just making me jump around to see what's actually happening rather than reading straight through the code.
Firstly, you only actually create a function either when it is being reused, or because it's functionality is a logically separable responsibility and so you factor it out for understandability.
Either way, the function should also have a meaningful name describing its purpose so you don't have to jump around to understand what's actually happening.
