[Terr_]

I'd like to add that NIH spaghetti sometimes comes from customer relationships rather than from exuberant developers.

The important customer wants just one tiny convenience-feature that fits their use case and it sorta makes sense... Which somehow keeps scope-creeping over time into a cancerous unplanned product which is expensive to support.

With the benefit of hindsight, you realize it's something the customer should have bought directly for themselves from a completely separate and more-qualified vendor. However they either didn't realize what they wanted or they were able to trick you into building an over-specialized product for their use case--for much cheaper than if they had hired a contractor to customize another better offering.