I think "maintenance" somewhat mischaracterizes it. In my experience, it's often that an engineer can build the typical use case over a weekend, but will have t

I think "maintenance" somewhat mischaracterizes it. In my experience, it's often that an engineer can build the typical use case over a weekend, but will have to continue pouring in more dev time while it's in production to handle a huge number of edge cases that weren't properly handled originally. That work is only "maintenance" because you already claimed the work was completed, and finance has it marked as having been put into service, so you can't capitalize further costs against it.