Comment by mind-blight

It really depends on what your use case is. E.g. of you're dealing with a lot of legacy integrations, dealing with all the edge cases can require a lot of code that you can't refactor away through cleverness.

Each integration is hopefully only a few thousand lines of code, but if you have 50 integrations you can easily break 100k loc just dealing with those. They just need to be encapsulated well so that the integration cruft is isolated from the core business logic, and they become relatively simple to reason about