They’re not mandatory. Not all modules have infrastructure code, and not all have so complex business logic that would make the separation justified. The most important hint on introducing an infra-module is a need to unit test the Business-Module.
For example, some of my own guilty displeasures are opera, old movies, and poetry. I don’t hate any of those, but I like them far less than I want to admit when I’m not writing a blog post about guilty displeasures. I have been to operas, including the full cycle of Wagner’s Nibelungen. I have friends who have made me watch black and white movies from the Hollywood golden age. I used to write poems as a teenager, like all sensitive and nerdy young men. But quite frankly, I don’t feel that I need any of those things in my life. When my friend who conducts operas at the university invites me to one, I patiently wait for the singers to quit singing so I can properly enjoy the instrumental parts of the music. When I must watch old movies, I spend 25% of the time reading the Wikipedia summary to keep myself entertained. When I read a book or blog post that quotes something in verse, I literally just skip it and hope it wasn’t important to understand the rest.
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The equation keeps the maximum error at 1 regardless of the denominator we’ve chosen. By that metric, a 1-good approximation is associated with s
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